picc的中断函数
#include <pic.h>/*
* Interrupt test for PIC
*
* Copyright (C)1997 HI-TECH Software.
* Freely distributable.
*/
static long count;
static bit bad_intr;
void
main(void)
{
/* setup stuff */
#ifdef _16C71
ADCON1 = 3;// 16C71 requires Port A reconfiguration
#endif
T0CS = 0;// Timer increments on instruction clock
TRISA = 0xFE;// Port A bit 0 is output
T0IE = 1;// Enable interrupt on TMR0 overflow
GIE = 1;// Global interrupt enable
for(;;)
CLRWDT(); // Idly kick the dog
}
static void interrupt
isr(void) // Here be interrupt function - the name is
// unimportant.
{
if(!T0IF)// Was this a timer overflow?
bad_intr = 1; // NO! Shock horror!
count++;// Add 1 to count - insert idle comment
T0IF = 0;// Clear interrupt flag, ready for next
PORTA ^= 1;// toggle bit 0 of Port A, to show we're alive
}
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