ATMega644p的pin change interrupt代码

只看该作者 · 2008-11-5 12:32

// 初始化部分
// Pin change interrupt
// PCINT20 enabled, other PCINTs disabled
PCIFR = 0x0f;        // clear all pin change interrupt flags
PCICR = (1<<PCIE2);        // PCINT23:16 enabled
PCMSK3 = 0;
PCMSK2 = (1<<PCINT20);    // PCINT20 enabled
PCMSK1 = 0;
PCMSK0 = 0;
...
sei();    // enable interrupts globally
...

// 中断服务程序
#pragma vector=PCINT2_vect
__interrupt void irqPCInt2(void)
{
    // PCIF2 bit in the PCIFR register is automatically cleared when interrupt service routine is executed

    static BOOL bDebug;
    if(bDebug){
        DEBUG_LO;
        bDebug = 0;
    }else{
        DEBUG_HI;
        bDebug = 1;
    }
}