CoE3DJ4 Digital Systems Design. Chapter 4: Timer operation
|
|
- Meghan Edwards
- 7 years ago
- Views:
Transcription
1 CoE3DJ4 Digital Systems Design Chapter 4: Timer operation
2 Timer There are two 16-bit timers each with four modes of operation Timers are used for (a) interval timing, (b) event counting or (c) baud rate generation for built in serial port Each 16-bit timer is in fact an asynchronous counter therefore the 16 th or last flip-flop divides the input clock frequency by 2 16 =65536 The output of last stage clocks an overflow flip-flop In interval timing applications, a timer is programmed to overflow at a regular interval and set the timer overflow flag Flag is used to synchronize the program to perform an action (e.g., turning on a light) Interval timing can be used to measure the elapsed time
3 TCON and TMOD Event counting is used to determine the number of occurrences of an event An event is an external stimulus that provides a 1 to 0 transition 8051 timers are accessed using six of SFRs (i.e., TCON, TMOD, TL0, TL1, TH0,TH1)
4 Timer Mode Register The TMOD register (89H) contains two groups of 4 bits that set the operating mode for Timer 0 and Timer 1. TMOD is not bit addressable and is loaded once at the beginning of a program to initialize the timer MSB LSB GATE C/T M1 M0 GATE C/T M1 M0 Timer 1 Timer 0 Bit Name GATE C/T M1 M0 GATE C/T M1 M0 Gate bit. If set, timer 1 will only increment while INT1 is high. Counter/timer select bit 1 = event counter external timing signal 0 = interval timer internal timing signal Mode bit 1 Mode bit 0 Timer 0 Gate bit Timer 0 counter/timer select bit Timer 0 M1 bit Timer 0 M0 bit Description
5 Timer Mode Definitions Using the M1 and M0 bits of the TMOD register, we can set the timers to operate in one of 4 possible modes: M1 M0 Mode Description bit timer mode bit timer mode bit auto reload mode Split timer mode: Timer 0: TL0 is an 8-bit timer controlled by timer 0 mode bits; TH0 the same except controlled by timer 1 mode bits. Timer 1: Stopped.
6 Timer Control Register The TCON register (88H) contains status and control bits for Timer0 and Timer1. Bit addressable. MSB LSB TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 Bit Name Description TCON.7 TCON.6 TCON.5 TCON.4 TCON.3 TCON.2 TCON.1 TCON.0 TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 Timer 1 overflow flag Timer 1 run-control bit. Used to turn the timer on/off Timer 0 overflow flag Timer 0 run-control bit. External Interrupt 1 edge flag External Interrupt 1 type flag External Interrupt 0 edge flag External Interrupt 0 type flag
7 TCON and TMOD Upper four bits in TCON (TCON.4 to TCON.7) are used to turn timers on and off (TR0,TR1) or signal a timer overflow (TF0,TF1) The lower four bits in TCON are used to detect and initiate external interrupts THx is used to represent TH0 or TH1
8 Timer Modes Mode 0 is a 13-bit timer mode and is not generally used in new designs Timer high-byte (THx) is cascaded with five least-significant bits of the timer low-byte (TLx) to form a 13-bit timer Upper three bits of TLx are not sued Mode 1 is a 16-bit timer mode Clock is applied to combined high and low timer registers (TLx/THx) Timer counts up and an overflow occurs on FFFF to 0000 transition and sets the timer overflow flag. The timer continues to count Overflow flag is the TFx bit in TCON
9 Timer Modes Mode 2 is 8-bit auto reload mode Timer s low-byte (TLx) operates as an 8-bit timer while timer high-byte (THx) holds a reload value When the count overflows from FF not only the flag is set, but the value in THx is loaded into TLx. Counting continues from this value up to next FF Mode 3 is split timer mode and is different for each timer Timer 0 in mode 3 is split into two 8-bit timers. TL0 and TH0 act as separate timers with overflow setting the TF0 and TF1 bits respectively Timer 1 can be switched into one of the other modes. The only limitation is that the usual timer 1 overflow flag TF1, in not affected by Timer 1 since it is connected to TH0.
10 Clocking sources How the timers are clocked? There are two sources for clock which can be selected by writing to the counter/timer (C/T) bit in TMOD when the timer is initialized. One source is for interval timing and the other one for event counting Interval timing: If C/T=0, timer is clocked from on-chip oscillator A divide by 12 stage is added to reduce the clocking frequency (for a 12 MHz oscillator the timer clock will be 1 MHz.
11 Clocking sources Event counting: If C/T=1, timer is clocked from an external source In most applications, external source supplies timer with a pulse upon the occurrence of an event, and the timer is an event counter External clock comes through Port 3 pins: P3.4 is the external clocking for Timer 0 and P3.5 is the clocking input for Timer 1. In counter applications, timer registers are incremented in response to a 1 to 0 transition
12 Starting, stopping and controlling timers Simplest method for starting and stopping timers is with runcontrol bit (TRx) in TCON TRx is clear after a system reset, therefore, timers are disabled by default TRx is set by software to start timers Example: to start Timer 0 SETB TR0 To stop Timer 0: CLR TR0 Another method for controlling timers is with GATE bit in TMOD and external input INTx (INT0 and INT1 are on Port 3, pins 2 and 3) Setting GATE=1 allows timer to be controlled by INTx
13 Starting, stopping and controlling timers Assume INT1 is low but pulses high for a period of time to be measured. Initialize Timer 1 for mode 2, 16 bit timer mode withtl1/th1=0000h, GATE=1 and TR1=1 When INT1 goes high, timer is gated on and is clocked at a rate of 1 MHz. When INT1 goes low, timer is gated off and duration of pulse in microseconds is the count in TL1/TH1
14 Initializing and accessing timer registers Timers are usually initialized once at the beginning of a program to set the correct operating mode Within the body of a program, timers are started, stopped, flag bits tested, cleared, timer registers read or updated and so on. Example: MOV TMOD, # B This instruction sets M1=0, M0=1 (for mode 1), leave C/T=0 and GATE=0, for internal clocking. Timer will not begin working until TR1 is set If an initial count is necessary timer registers (e.g., TL1/TH1) must also be initialized. Timer counts up and sets the overflow flag on an FFFFH to 0000H transition
15 Initializing and accessing timer registers Example: a 100 us interval could be timed by initializing TL1/TH1 to 100 counts less than 0000H which is FF9CH. MOV TL1,#9CH MOV TH1,#FFH SETB TR1 Overflow flag is automatically set 100 us later. A loop can check to see when the overflow flag is set WAIT: JNB TF1, WAIT When timer overflows, it is necessary to stop timer and clear the overflow flag: CLR TR1 CLR TF1
16 Initializing and accessing timer registers In some applications it is necessary to read the value in timer registers on the fly Possible problem: if we read the low byte first and the high byte second and between these two reads the low byte overflows into high byte we have a wrong read value Solution: Read high-byte first, then low-byte and read highbyte again. If high-byte has changed repeat read operation AGAIN: MOV A, TH1 MOV R6,TL1 CJNE A, TH1, AGAIN MOV R7,A
17 Short intervals and long intervals Interval in microseconds No limit Technique Software tuning 8-bit timer with auto reload 16 bit timer 16 bit timer plus software loops Write a program that creates a periodic waveform on P1.0 with as high a frequency as possible. What are frequency and duty cycle of waveform? LOOP: SETB P1.0 CLR P1.0 SJUMP LOOP Creates a pulse waveform on P1.0 with a period of 4 us. Signal is high for 1 us (duty cycle of 25%) Period of waveform can be lengthened by inserting NOP instructions into loop
18 Short intervals and long intervals Example: Write a program using Timer 0 to create a 10 khz square wave on P1.0 MOV TMOD,#02H MOV TH0,#-50 SETB TR0 LOOP: JNB TF0, LOOP CLR TF0 CPL P1.0 SJMP LOOP This program creates a square wave on P1.0 with a high-time of 50 us and low time of 50 us. CPL is a complement bit instruction
19 Short intervals and long intervals Example: write a program using timer 0 to create a 1 khz square wave on P1.0 MOV TMOD,#01H LOOP: MOV TH0,#FEH MOV TL0,#0CH SETB TR0 WAIT: JNB TF0,WAIT CLR TR0 CLR TF0 CPL P1.0 SJMP LOOP A 1kHz square wave requires a high time of 500 us and a low time of 500 us. Sine the interval is longer than 256 us, mode 2 cannot be used. Mode 1 (16 bit) is required.
20 Short intervals and long intervals Example: A buzzer is connected to P1.7, and a debounced switch is connected to P1.6. Write a program that reads logic level provided by the switch and sounds the buzzer for 1 second for each 1 to 0 transition detected.
21 HUNDRED EQU 100 COUNT EQU ORG 8100H MOV TMOD, #01H LOOP: JNB P1.6, LOOP WAIT: JB P1.6, WAIT SETB P1.7 CALL DELAY CLR P1.7 SJMP LOOP DELAY: MOV R7,#HUNDRED AGAIN: MOV TH0,#HIGH CONT MOV TL0,#LOW COUNT SETB TR0 WAIT2: JNB TF0,WAIT2 CLR TF0 CLR TR0 DJNZ R7,AGAIN RET END
CoE3DJ4 Digital Systems Design. Chapter 4: Timer operation
CoE3DJ4 Digital Systems Design Chapter 4: Timer operation Timer There are two 16-bit timers each with four modes of operation Timers are used for (a) interval timing, (b) event counting or (c) baud rate
More information8051 Serial Port. Crystal TXD. I/O Device RXD. Embedded Systems 1 5-1 8051 Peripherals
8051 Serial Port The 8051 contains a UART Universal Asynchronous Receiver Transmitter The serial port is full-duplex It can transmit and receive simultaneously 2 Port 3 pins are used to provide the serial
More informationFlash Microcontroller. Memory Organization. Memory Organization
The information presented in this chapter is collected from the Microcontroller Architectural Overview, AT89C51, AT89LV51, AT89C52, AT89LV52, AT89C2051, and AT89C1051 data sheets of this book. The material
More informationAN108 IMPLEMENTING A REALTIME CLOCK. Relevant Devices. Introduction. Key Points. Overview
IMPLEMENTING A REALTIME CLOCK Relevant Devices This application note applies to the following devices: C8051F000, C8051F001, C8051F002, C8051F005, C8051F006, C8051F007, C8051F010, C8051F011, and C8051F012.
More informationExperiment # 9. Clock generator circuits & Counters. Eng. Waleed Y. Mousa
Experiment # 9 Clock generator circuits & Counters Eng. Waleed Y. Mousa 1. Objectives: 1. Understanding the principles and construction of Clock generator. 2. To be familiar with clock pulse generation
More information4 Character 5x7 LED Matrix Display
Mini project report on 4 Character 5x7 LED Matrix Display Submitted by Agarwal Vikas, MTech II, CEDT K.Sreenivasulu M.E (Micro) II, CEDT CENTRE FOR ELECTRONICS DESIGN AND TECHNOLOGY INDIAN INSTITUTE OF
More informationAVR Timer/Counter. Prof Prabhat Ranjan DA-IICT, Gandhinagar
AVR Timer/Counter Prof Prabhat Ranjan DA-IICT, Gandhinagar 8-bit Timer/Counter0 with PWM Single Compare Unit Counter Clear Timer on Compare Match (Auto Reload) Glitch-free, Phase Correct Pulse Width Modulator
More informationDEPARTMENT OF COMPUTER SCIENCE & ENGINEERING Question Bank Subject Name: EC6504 - Microprocessor & Microcontroller Year/Sem : II/IV
DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING Question Bank Subject Name: EC6504 - Microprocessor & Microcontroller Year/Sem : II/IV UNIT I THE 8086 MICROPROCESSOR 1. What is the purpose of segment registers
More informationETEC 2301 Programmable Logic Devices. Chapter 10 Counters. Shawnee State University Department of Industrial and Engineering Technologies
ETEC 2301 Programmable Logic Devices Chapter 10 Counters Shawnee State University Department of Industrial and Engineering Technologies Copyright 2007 by Janna B. Gallaher Asynchronous Counter Operation
More informationEmbedded. Engineer s. Development. Tool (EEDT 5.0)
Embedded Engineer s Development Tool (EEDT 5.0) User Manual and Tutorial Handbook DeccanRobots Developed and Distributed by DeccanRobots As a part of Embedded Engineer s Development Tool 5.0 www.deccanrobots.com
More informationSmall Hardware Development and Prototyping Board for the SX28
Project Report: Small Hardware Development and Prototyping Board for the SX28 Project Number: PR57 1. Project Description 2. Schematic Diagram 3. Physical Diagram 4. Component Layout Diagram 5. Bill of
More informationSection 14. Compare/Capture/PWM (CCP)
M Section 14. Compare/Capture/PWM (CCP) HIGHLIGHTS This section of the manual contains the following major topics: 14.1 Introduction...14-2 14.2 Control Register...14-3 14.3 Capture Mode...14-4 14.4 Compare
More information8051 hardware summary
8051 hardware summary 8051 block diagram 8051 pinouts + 5V ports port 0 port 1 port 2 port 3 : dual-purpose (general-purpose, external memory address and data) : dedicated (interfacing to external devices)
More informationCounters and Decoders
Physics 3330 Experiment #10 Fall 1999 Purpose Counters and Decoders In this experiment, you will design and construct a 4-bit ripple-through decade counter with a decimal read-out display. Such a counter
More informationInterfacing Analog to Digital Data Converters
Converters In most of the cases, the PIO 8255 is used for interfacing the analog to digital converters with microprocessor. We have already studied 8255 interfacing with 8086 as an I/O port, in previous
More informationChapter 9 Latches, Flip-Flops, and Timers
ETEC 23 Programmable Logic Devices Chapter 9 Latches, Flip-Flops, and Timers Shawnee State University Department of Industrial and Engineering Technologies Copyright 27 by Janna B. Gallaher Latches A temporary
More informationASYNCHRONOUS COUNTERS
LB no.. SYNCHONOUS COUNTES. Introduction Counters are sequential logic circuits that counts the pulses applied at their clock input. They usually have 4 bits, delivering at the outputs the corresponding
More information8254 PROGRAMMABLE INTERVAL TIMER
PROGRAMMABLE INTERVAL TIMER Y Y Y Compatible with All Intel and Most Other Microprocessors Handles Inputs from DC to 10 MHz 8 MHz 8254 10 MHz 8254-2 Status Read-Back Command Y Y Y Y Y Six Programmable
More informationReal-Time Clock. * Real-Time Computing, edited by Duncan A. Mellichamp, Van Nostrand Reinhold
REAL-TIME CLOCK Real-Time Clock The device is not a clock! It does not tell time! It has nothing to do with actual or real-time! The Real-Time Clock is no more than an interval timer connected to the computer
More informationCHAPTER 11: Flip Flops
CHAPTER 11: Flip Flops In this chapter, you will be building the part of the circuit that controls the command sequencing. The required circuit must operate the counter and the memory chip. When the teach
More informationAsynchronous counters, except for the first block, work independently from a system clock.
Counters Some digital circuits are designed for the purpose of counting and this is when counters become useful. Counters are made with flip-flops, they can be asynchronous or synchronous and they can
More informationNTE2053 Integrated Circuit 8 Bit MPU Compatible A/D Converter
NTE2053 Integrated Circuit 8 Bit MPU Compatible A/D Converter Description: The NTE2053 is a CMOS 8 bit successive approximation Analog to Digital converter in a 20 Lead DIP type package which uses a differential
More informationModule 3: Floyd, Digital Fundamental
Module 3: Lecturer : Yongsheng Gao Room : Tech - 3.25 Email : yongsheng.gao@griffith.edu.au Structure : 6 lectures 1 Tutorial Assessment: 1 Laboratory (5%) 1 Test (20%) Textbook : Floyd, Digital Fundamental
More informationADS9850 Signal Generator Module
1. Introduction ADS9850 Signal Generator Module This module described here is based on ADS9850, a CMOS, 125MHz, and Complete DDS Synthesizer. The AD9850 is a highly integrated device that uses advanced
More information8-bit Microcontroller with 2/4-Kbyte Flash AT89LP2052 AT89LP4052
Features Compatible with MCS 51 Products 20 MIPS Throughput at 20 MHz Clock Frequency and 2.4V, 85 C Operating Conditions Single Clock Cycle per Byte Fetch 2/4K Bytes of In-System Programmable (ISP) Flash
More informationCascaded Counters. Page 1 BYU
Cascaded Counters Page 1 Mod-N Counters Generally we are interested in counters that count up to specific count values Not just powers of 2 A mod-n counter has N states Counts from 0 to N-1 then rolls
More informationTimer A (0 and 1) and PWM EE3376
Timer A (0 and 1) and PWM EE3376 General Peripheral Programming Model Each peripheral has a range of addresses in the memory map peripheral has base address (i.e. 0x00A0) each register used in the peripheral
More informationARM Thumb Microcontrollers. Application Note. Software ISO 7816 I/O Line Implementation. Features. Introduction
Software ISO 7816 I/O Line Implementation Features ISO 7816-3 compliant (direct convention) Byte reception and transmission with parity check Retransmission on error detection Automatic reception at the
More informationDIGITAL ELECTRONICS. Counters. By: Electrical Engineering Department
Counters By: Electrical Engineering Department 1 Counters Upon completion of the chapter, students should be able to:.1 Understand the basic concepts of asynchronous counter and synchronous counters, and
More informationHi Hsiao-Lung Chan Dept Electrical Engineering Chang Gung University, Taiwan
PIC18 Timer Programming g Hi Hsiao-Lung Chan Dept Electrical Engineering Chang Gung University, Taiwan chanhl@mail.cgu.edu.twcgu Functions of PIC18 timer Functions of the timer Generate a time delay As
More information24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales FEATURES S8550 VFB. Analog Supply Regulator. Input MUX. 24-bit Σ ADC. PGA Gain = 32, 64, 128
24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales DESCRIPTION Based on Avia Semiconductor s patented technology, HX711 is a precision 24-bit analogto-digital converter (ADC) designed for weigh
More information8-Bit Flash Microcontroller for Smart Cards. AT89SCXXXXA Summary. Features. Description. Complete datasheet available under NDA
Features Compatible with MCS-51 products On-chip Flash Program Memory Endurance: 1,000 Write/Erase Cycles On-chip EEPROM Data Memory Endurance: 100,000 Write/Erase Cycles 512 x 8-bit RAM ISO 7816 I/O Port
More informationHardware and Software Requirements
C Compiler Real-Time OS Simulator Training Evaluation Boards Installing and Using the Keil Monitor-51 Application Note 152 May 31, 2000, Munich, Germany by Keil Support, Keil Elektronik GmbH support.intl@keil.com
More informationUniversity of Portsmouth Faculty of Technology Department of Electronic and Computer Engineering. Content
University of Portsmouth Faculty of Technology Department of Electronic and Computer Engineering Module: Principles of DigitalSystems Module Code: B122L Module Topic: Microcontroller Applications Lecturer:
More informationSerial Communications
Serial Communications 1 Serial Communication Introduction Serial communication buses Asynchronous and synchronous communication UART block diagram UART clock requirements Programming the UARTs Operation
More informationFlash Microcontroller. Architectural Overview. Features. Block Diagram. Figure 1. Block Diagram of the AT89C core
Features 8-Bit CPU Optimized for Control Applications Extensive Boolean Processing Capabilities (Single-Bit Logic) On-Chip Flash Program Memory On-Chip Data RAM Bidirectional and Individually Addressable
More informationTo design digital counter circuits using JK-Flip-Flop. To implement counter using 74LS193 IC.
8.1 Objectives To design digital counter circuits using JK-Flip-Flop. To implement counter using 74LS193 IC. 8.2 Introduction Circuits for counting events are frequently used in computers and other digital
More information8085 MICROPROCESSOR PROGRAMS
8085 MICROPROCESSOR PROGRAMS 1 ADDITION OF TWO 8 BIT NUMBERS AIM: To perform addition of two 8 bit numbers using 8085. ALGORITHM: 1) Start the program by loading the first data into Accumulator. 2) Move
More informationDebouncing Switches. Mechanical switches are one of the most common interfaces to a uc.
Mechanical switches are one of the most common interfaces to a uc. Switch inputs are asynchronous to the uc and are not electrically clean. Asynchronous inputs can be handled with a synchronizer (2 FF's).
More information6-BIT UNIVERSAL UP/DOWN COUNTER
6-BIT UNIVERSAL UP/DOWN COUNTER FEATURES DESCRIPTION 550MHz count frequency Extended 100E VEE range of 4.2V to 5.5V Look-ahead-carry input and output Fully synchronous up and down counting Asynchronous
More informationDS1621 Digital Thermometer and Thermostat
Digital Thermometer and Thermostat www.dalsemi.com FEATURES Temperature measurements require no external components Measures temperatures from 55 C to +125 C in 0.5 C increments. Fahrenheit equivalent
More informationLesson-16: Real time clock DEVICES AND COMMUNICATION BUSES FOR DEVICES NETWORK
DEVICES AND COMMUNICATION BUSES FOR DEVICES NETWORK Lesson-16: Real time clock 1 Real Time Clock (RTC) A clock, which is based on the interrupts at preset intervals. An interrupt service routine executes
More informationDP8570A DP8570A Timer Clock Peripheral (TCP)
DP8570A DP8570A Timer Clock Peripheral (TCP) Literature Number: SNAS557 DP8570A Timer Clock Peripheral (TCP) General Description The DP8570A is intended for use in microprocessor based systems where information
More information8051 MICROCONTROLLER COURSE
8051 MICROCONTROLLER COURSE Objective: 1. Familiarization with different types of Microcontroller 2. To know 8051 microcontroller in detail 3. Programming and Interfacing 8051 microcontroller Prerequisites:
More informationT.C. Yeditepe University. Department of Electrical-Electronics Engineering
T.C. Yeditepe University Department of Electrical-Electronics Engineering Microcontrollers Term Project Report Digital Frequencymeter Prof.Dr.Herman Sedef Enis Ürel Fatih Erdem 25.12.2008 Purpose: To design
More informationKeil C51 Cross Compiler
Keil C51 Cross Compiler ANSI C Compiler Generates fast compact code for the 8051 and it s derivatives Advantages of C over Assembler Do not need to know the microcontroller instruction set Register allocation
More information150127-Microprocessor & Assembly Language
Chapter 3 Z80 Microprocessor Architecture The Z 80 is one of the most talented 8 bit microprocessors, and many microprocessor-based systems are designed around the Z80. The Z80 microprocessor needs an
More informationPART B QUESTIONS AND ANSWERS UNIT I
PART B QUESTIONS AND ANSWERS UNIT I 1. Explain the architecture of 8085 microprocessor? Logic pin out of 8085 microprocessor Address bus: unidirectional bus, used as high order bus Data bus: bi-directional
More informationDecimal Number (base 10) Binary Number (base 2)
LECTURE 5. BINARY COUNTER Before starting with counters there is some vital information that needs to be understood. The most important is the fact that since the outputs of a digital chip can only be
More informationAT89C1051. 8-Bit Microcontroller with 1 Kbyte Flash. Features. Description. Pin Configuration
AT89C1051 Features Compatible with MCS-51 Products 1 Kbyte of Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles 2.7 V to 6 V Operating Range Fully Static Operation: 0 Hz to 24 MHz Two-Level
More informationBINARY CODED DECIMAL: B.C.D.
BINARY CODED DECIMAL: B.C.D. ANOTHER METHOD TO REPRESENT DECIMAL NUMBERS USEFUL BECAUSE MANY DIGITAL DEVICES PROCESS + DISPLAY NUMBERS IN TENS IN BCD EACH NUMBER IS DEFINED BY A BINARY CODE OF 4 BITS.
More informationBelow is a diagram explaining the data packet and the timing related to the mouse clock while receiving a byte from the PS-2 mouse:
PS-2 Mouse: The Protocol: For out mini project we designed a serial port transmitter receiver, which uses the Baud rate protocol. The PS-2 port is similar to the serial port (performs the function of transmitting
More informationLecture-3 MEMORY: Development of Memory:
Lecture-3 MEMORY: It is a storage device. It stores program data and the results. There are two kind of memories; semiconductor memories & magnetic memories. Semiconductor memories are faster, smaller,
More informationWEEK 8.1 Registers and Counters. ECE124 Digital Circuits and Systems Page 1
WEEK 8.1 egisters and Counters ECE124 igital Circuits and Systems Page 1 Additional schematic FF symbols Active low set and reset signals. S Active high set and reset signals. S ECE124 igital Circuits
More informationContents COUNTER. Unit III- Counters
COUNTER Contents COUNTER...1 Frequency Division...2 Divide-by-2 Counter... 3 Toggle Flip-Flop...3 Frequency Division using Toggle Flip-flops...5 Truth Table for a 3-bit Asynchronous Up Counter...6 Modulo
More informationETEC 421 - Digital Controls PIC Lab 10 Pulse Width Modulation
ETEC 421 - Digital Controls PIC Lab 10 Pulse Width Modulation Program Definition: Write a program to control the speed of a dc motor using pulse width modulation. Discussion: The speed of a dc motor is
More informationOld Company Name in Catalogs and Other Documents
To our customers, Old Company Name in Catalogs and Other Documents On April 1 st, 2010, NEC Electronics Corporation merged with Renesas Technology Corporation, and Renesas Electronics Corporation took
More informationDIGITAL COUNTERS. Q B Q A = 00 initially. Q B Q A = 01 after the first clock pulse.
DIGITAL COUNTERS http://www.tutorialspoint.com/computer_logical_organization/digital_counters.htm Copyright tutorialspoint.com Counter is a sequential circuit. A digital circuit which is used for a counting
More informationMicrotronics technologies Mobile: 99707 90092
For more Project details visit: http://www.projectsof8051.com/rfid-based-attendance-management-system/ Code Project Title 1500 RFid Based Attendance System Synopsis for RFid Based Attendance System 1.
More informationDS1621 Digital Thermometer and Thermostat
www.maxim-ic.com FEATURES Temperature measurements require no external components Measures temperatures from -55 C to +125 C in 0.5 C increments. Fahrenheit equivalent is -67 F to 257 F in 0.9 F increments
More informationDigital Logic Design Sequential circuits
Digital Logic Design Sequential circuits Dr. Eng. Ahmed H. Madian E-mail: ahmed.madian@guc.edu.eg Dr. Eng. Rania.Swief E-mail: rania.swief@guc.edu.eg Dr. Eng. Ahmed H. Madian Registers An n-bit register
More informationhttp://www.abacom-online.de/div/setup_usb_µpio.exe
USB-µPIO USB AVR board Compact AVR board with Atmel ATmega168-20 High speed clock frequency 18.432000 MHz 100% error free High baud rates Screw-terminal and pin connections 6 pin ISP connector Power supply
More informationDS1678 Real-Time Event Recorder
DS1678 Real-Time Event Recorder www.maxim-ic.com GENERAL DESCRIPTION The DS1678 real-time clock (RTC) event recorder records the time and date of a nonperiodic, asynchronous event each time the INT pin
More informationNJU6061. Full Color LED Controller Driver with PWM Control GENERAL DESCRIPTION PACKAGE OUTLINE FEATURES
Full Color LED Controller Driver with PWM Control GENERAL DESCRIPTION The NJU6061 is a full color LED controller driver. It can control and drive a 3 in 1 packaged (Red, Green and Blue) LED. The NJU6061
More informationSPI. Overview and Use of the PICmicro Serial Peripheral Interface. Getting Started: SPI
SPI Overview and Use of the PICmicro Serial Peripheral Interface In this presentation, we will look at what the Serial Peripheral Interface, otherwise known as the SPI, is, and how it is used to communicate
More informationDigital Systems Based on Principles and Applications of Electrical Engineering/Rizzoni (McGraw Hill
Digital Systems Based on Principles and Applications of Electrical Engineering/Rizzoni (McGraw Hill Objectives: Analyze the operation of sequential logic circuits. Understand the operation of digital counters.
More informationCounters & Shift Registers Chapter 8 of R.P Jain
Chapter 3 Counters & Shift Registers Chapter 8 of R.P Jain Counters & Shift Registers Counters, Syllabus Design of Modulo-N ripple counter, Up-Down counter, design of synchronous counters with and without
More informationA High Resolution Performance Monitoring Software on the Pentium
A High Resolution Performance Monitoring Software on the Pentium Ong Cheng Soon*, Fadhli Wong Mohd Hasan Wong**, Lai Weng Kin* * Software Lab, MIMOS Berhad lai@mimos.my, csong@mimos.my ** Dept of Electrical
More informationAP32084. TriCore. Sinusodial 3-Phase Output Generation Using The TriCore General Purpose Timer Array. Microcontrollers
Application Note, V 1.0, Jan. 2005 AP32084 TriCore Sinusodial 3-Phase Output Generation Using The TriCore Microcontrollers Never stop thinking. TriCore Revision History: 2005-01 V 1.0 Previous Version:
More informationFlip-Flops, Registers, Counters, and a Simple Processor
June 8, 22 5:56 vra235_ch7 Sheet number Page number 349 black chapter 7 Flip-Flops, Registers, Counters, and a Simple Processor 7. Ng f3, h7 h6 349 June 8, 22 5:56 vra235_ch7 Sheet number 2 Page number
More informationDesign and Implementation of Home Monitoring System Using RF Technology
International Journal of Advances in Electrical and Electronics Engineering 59 Available online at www.ijaeee.com & www.sestindia.org/volume-ijaeee/ ISSN: 2319-1112 Design and Implementation of Home Monitoring
More informationDigital Fundamentals
igital Fundamentals with PL Programming Floyd Chapter 9 Floyd, igital Fundamentals, 10 th ed, Upper Saddle River, NJ 07458. All Rights Reserved Summary Latches (biestables) A latch is a temporary storage
More informationDesign Example: Counters. Design Example: Counters. 3-Bit Binary Counter. 3-Bit Binary Counter. Other useful counters:
Design Eample: ers er: a sequential circuit that repeats a specified sequence of output upon clock pulses. A,B,C,, Z. G, O, T, E, R, P, S,!.,,,,,,,7. 7,,,,,,,.,,,,,,,,,,,. Binary counter: follows the binary
More informationAtmel Norway 2005. XMEGA Introduction
Atmel Norway 005 XMEGA Introduction XMEGA XMEGA targets Leadership on Peripheral Performance Leadership in Low Power Consumption Extending AVR market reach XMEGA AVR family 44-100 pin packages 16K 51K
More informationCounters. Present State Next State A B A B 0 0 0 1 0 1 1 0 1 0 1 1 1 1 0 0
ounter ounters ounters are a specific type of sequential circuit. Like registers, the state, or the flip-flop values themselves, serves as the output. The output value increases by one on each clock cycle.
More informationMACHINE ARCHITECTURE & LANGUAGE
in the name of God the compassionate, the merciful notes on MACHINE ARCHITECTURE & LANGUAGE compiled by Jumong Chap. 9 Microprocessor Fundamentals A system designer should consider a microprocessor-based
More informationMemory Elements. Combinational logic cannot remember
Memory Elements Combinational logic cannot remember Output logic values are function of inputs only Feedback is needed to be able to remember a logic value Memory elements are needed in most digital logic
More informationAVR305: Half Duplex Compact Software UART. 8-bit Microcontrollers. Application Note. Features. 1 Introduction
AVR305: Half Duplex Compact Software UART Features 32 Words of Code, Only Handles Baud Rates of up to 38.4 kbps with a 1 MHz XTAL Runs on Any AVR Device Only Two Port Pins Required Does Not Use Any Timer
More informationMaster/Slave Flip Flops
Master/Slave Flip Flops Page 1 A Master/Slave Flip Flop ( Type) Gated latch(master) Gated latch (slave) 1 Gate Gate GATE Either: The master is loading (the master in on) or The slave is loading (the slave
More information1. Learn about the 555 timer integrated circuit and applications 2. Apply the 555 timer to build an infrared (IR) transmitter and receiver
Electronics Exercise 2: The 555 Timer and its Applications Mechatronics Instructional Laboratory Woodruff School of Mechanical Engineering Georgia Institute of Technology Lab Director: I. Charles Ume,
More informationObjectives. Basics of Serial Communication. Simplex vs Duplex. CMPE328 Microprocessors (Spring 2007-08) Serial Interfacing. By Dr.
CMPE328 Microprocessors (Spring 27-8) Serial Interfacing By Dr. Mehmet Bodur Objectives Upon completion of this chapter, you will be able to: List the advantages of serial communication over parallel communication
More informationAVR131: Using the AVR s High-speed PWM. Introduction. Features. AVR 8-bit Microcontrollers APPLICATION NOTE
AVR 8-bit Microcontrollers AVR131: Using the AVR s High-speed PWM APPLICATION NOTE Introduction This application note is an introduction to the use of the high-speed Pulse Width Modulator (PWM) available
More informationLC7218, 7218M, 7218JM
Ordering number : EN4758B CMOS LSI LC7218, 7218M, 7218JM PLL Frequency Synthesizer for Electronic Tuning in AV Systems Overview The LC7218, LC7218M and LC7218JM are PLL frequency synthesizers for electronic
More information(Refer Slide Time: 00:01:16 min)
Digital Computer Organization Prof. P. K. Biswas Department of Electronic & Electrical Communication Engineering Indian Institute of Technology, Kharagpur Lecture No. # 04 CPU Design: Tirning & Control
More informationWTV020-SD MODULE WTV020-SD-20S and WTV020-SD-16P
WTV020-SD MODULE WTV020-SD-20S and WTV020-SD-16P 1.PRODUCT FEATURES... 2 3.APPLICATION DIAGRAM... 3 4.APPLICATIONS... 3 5.PINS... 4 5.1.WTV020-SD-20S... 4 5.2.WTV020-SD-16P... 5 6.MODULE SELECTION... 5
More informationcss Custom Silicon Solutions, Inc.
css Custom Silicon Solutions, Inc. GENERAL PART DESCRIPTION The is a micropower version of the popular timer IC. It features an operating current under µa and a minimum supply voltage of., making it ideal
More informationIntroduction the Serial Communications Huang Sections 9.2, 10.2 SCI Block User Guide SPI Block User Guide
Introduction the Serial Communications Huang Sections 9.2, 10.2 SCI Block User Guide SPI Block User Guide Parallel Data Transfer Suppose you need to transfer data from one HCS12 to another. How can you
More informationM25P05-A. 512-Kbit, serial flash memory, 50 MHz SPI bus interface. Features
512-Kbit, serial flash memory, 50 MHz SPI bus interface Features 512 Kbits of flash memory Page program (up to 256 bytes) in 1.4 ms (typical) Sector erase (256 Kbits) in 0.65 s (typical) Bulk erase (512
More informationDevelop a Dallas 1-Wire Master Using the Z8F1680 Series of MCUs
Develop a Dallas 1-Wire Master Using the Z8F1680 Series of MCUs AN033101-0412 Abstract This describes how to interface the Dallas 1-Wire bus with Zilog s Z8F1680 Series of MCUs as master devices. The Z8F0880,
More informationAN974 APPLICATION NOTE
AN974 APPLICATION NOTE Real time clock with ST7 Timer Output Compare By MCD Application Team 1 INTRODUCTION The purpose of this note is to present how to use the ST7 Timer output compare function. As an
More informationHD44780U (LCD-II) (Dot Matrix Liquid Crystal Display Controller/Driver)
HD4478U (LCD-II) (Dot Matrix Liquid Crystal Display Controller/Driver) Description The HD4478U dot-matrix liquid crystal display controller and driver LSI displays alphanumerics, Japanese kana characters,
More informationSystems I: Computer Organization and Architecture
Systems I: omputer Organization and Architecture Lecture 8: Registers and ounters Registers A register is a group of flip-flops. Each flip-flop stores one bit of data; n flip-flops are required to store
More informationDS2155 T1/E1/J1 Single-Chip Transceiver
www.maxim-ic.com ERRATA SHEET DS2155 T1/E1/J1 Single-Chip Transceiver REVISION A3 ERRATA The errata listed below describe situations where DS2155 revision A3 components perform differently than expected
More informationAsynchronous Counters. Asynchronous Counters
Counters and State Machine Design November 25 Asynchronous Counters ENGI 25 ELEC 24 Asynchronous Counters The term Asynchronous refers to events that do not occur at the same time With respect to counter
More informationCOMBINATIONAL and SEQUENTIAL LOGIC CIRCUITS Hardware implementation and software design
PH-315 COMINATIONAL and SEUENTIAL LOGIC CIRCUITS Hardware implementation and software design A La Rosa I PURPOSE: To familiarize with combinational and sequential logic circuits Combinational circuits
More informationLesson 12 Sequential Circuits: Flip-Flops
Lesson 12 Sequential Circuits: Flip-Flops 1. Overview of a Synchronous Sequential Circuit We saw from last lesson that the level sensitive latches could cause instability in a sequential system. This instability
More informationThe components. E3: Digital electronics. Goals:
E3: Digital electronics Goals: Basic understanding of logic circuits. Become familiar with the most common digital components and their use. Equipment: 1 st. LED bridge 1 st. 7-segment display. 2 st. IC
More informationQuick Start Tutorial. Using the TASKING* Software Development Tools with the Intel 8x930 Family Evaluation Board
Quick Start Tutorial Using the TASKING* Software Development Tools with the Intel 8x930 Family Evaluation Board This explains how to use the TASKING Microsoft* Windows*-based software development tools
More informationEmbedded Based Automated Student Attendance Governing System
International Journal of Engineering and Advanced Technology (IJEAT) ISSN: 2249 8958, Volume-2, Issue-5, June 2013 Embedded Based Automated Student Attendance Governing System Sahana S Bhandari Abstract
More information