Time'n and Count'n

Time'n and Count'n

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"Time'n and Count'n" is an intermediate level book on 16-bit timing and counting applications using Microchip Technology's PIC microcontrollers. More opportunities for creating fun projects are described. Learning to use timer 1 with it's powerful capture, compare and pulse width modulation modes will expand your PIC microcontroller design capabilities significantly. TMR1 is a 16-bit timer/counter. The maximum count is 65,535 vs. 255 for timer 0.TMR1 used in conjunction with the capture, compare, PWM module may be programmed to do useful things unattended leaving the PIC free to perform other tasks. A special pin may be used for external inputs to TMR1 and another special pin may be used as an external output from TMR1. These timing and counting techniques serve as the basis for designing and building your own period and frequency generating and measuring test equipment as described in the book. By David Benson (8-1/2 x 11 format, 218 pages). TABLE OF CONTENTS: INTRODUCTION TEST EQUIPMENT FOR TIMING AND COUNTING EXPERIMENTS Test equipment for detecting a short single pulse and measuring it's width Pulse generator - 32 microseconds Pulse generator - 128 microseconds Pulse generator - 2000 microseconds Pulse generator - 65280 microseconds Test equipment for generating a frequency output USING TIMER 1, TIMER 2 AND THE CAPTURE/COMPARE/PWM (CCP) MODULE PIC16F870 test circuit Before we take off TMR2: 8-bit timer TMR2 description How to choose/select mode of operation Interrupts TMR2 applications Free running mode (via TMR2 interrupt) Free running mode (via period register) TMR1: 16-bit timer/counter and capture/compare module TMR1/CCP module simplified TMR1 description CCP module - capture mode CCP module - compare mode CCP module - PWM mode How to choose/select mode of operation T1CON register CCP1CON register Interrupts Reading and writing TMR1 Long time intervals Controlling the CCP1 pin in compare mode More than one way to do timing stuff Timing and counting experiments Free running output (via TMR1 interrupt) Event counting (via TMR1) Count events, read TMR1 contents Capture TMR1 count when external event occurs Count events up to predetermined number and generate an output (compare) Single time interval output (via TMR1 and CCP, compare mode) Start TMR1, auto end 500 milliseconds 128 microseconds Free running output (via TMR1 and CCP, compare mode) Clear TMR1 each cycle Free running TMR1, add interval value to compare register each cycle Time measurement (period/interval/time between events) (via TMR1 read)(interval input via port pin) (via TMR1 and CCP, capture mode)(interval input via CCP1 pin, two captures,subtract) Frequency measurement (via TMR1, gate via TMR0) External 32,768 Hz watch crystal-based clock for TMR1 Pulse width modulation (PWM) using TMR2 and the CCP module Analog output - increase/decrease buttons - PWM - 8-bit mode Duty cycle - 10-bit mode Analog output - increase/decrease buttons - PWM - 10-bit mode DESIGNING AND BUILDING YOUR OWN TEST EQUIPMENT Keypad/LCD user interface 5-digit decimal to 16-bit binary entry program Using the 5-digit decimal to 16-bit binary entry program Digital pulse generator Digital frequency generator Time interval measurement instrument Frequency measurement instrument Creating your own combination signal generator and measurement instrument APPENDIX A - Program listings vs. page number APPENDIX B - PICF870 control registers APPENDIX C - '84 on a board APPENDIX D - PIC/LCD schematic and code APPENDIX E - Keypad APPENDIX F - Using the ICD APPENDIX G - Sources

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