PIC18, MPLAB X IDE, XC8, TIMER, Interrupt

PIC18, MPLAB X IDE, XC8, TIMER, Interrupt

0. 참고 사항

• https://www.exploreembedded.com/wiki/PIC18F4520_Timer
  
• [  ] https://www.microchip.com/wwwproducts/en/PIC18F4520
• [ datasheet ] http://ww1.microchip.com/downloads/en/devicedoc/39631a.pdf

1. HW 연결

2. 소스 설명

full 소스는 아래 github를 통해 확인하세요.

RegValue = TimerMax-((Delay * Fosc)/(Prescalar*4)) delay = ((MaxValue-REG_val)*(Prescal*4))/Fosc regvalue = 256 - ((0.02s * 1000000)/(32*4))     = 256 - ((20000)/128))     = 256 - 156.25     = 99.75 delay = (256 - 101) * (32 * 4)/1000000     = 150 * 128 / 1000000     = 19200 / 1000000     = 0.0192s     = 19.2ms     = 20ms   regvalue = 65536 - ((0.02s * 1000000)/(32*4))     = 65536 - ((20000)/128))     = 65536 - 156.25     = 65379.75     = 0xFF63 delay = (65536 - 65379) * (32 * 4)/1000000         = (157) * (128)/1000000         = 0.020096s         = 20ms

3. 소스

•  https://github.com/sglee0223/pic18/tree/master/timer_interrupt.X

4. 결과

20ms 단위입니다.