我使用PIT中断，控制M口输出点灯，单步调试的时候发现没有进入中断，我是初学者，刚刚接触freescale，用的XDP512， 希望有人能指点一下，再初学的路上点亮一盏灯，帮我过了这道坎，感激不尽。 我的代码：#include <hidef.h> /* common defines and macros */
#include <mc9s12xdp512.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12xdp512"
void SetupPITimer (void)
{
/* time-out period = (PITMTLD0 + 1) * (PITLD0 + 1) / Fbus */
PITCFLMT = 0x81; /* PFLMT0=1 (reload MT0) */
PITFLT = 0x01; /* force reload of PIT channel 0 */
PITMUX = 0x00;
PITCE = 0x01;
PITINTE = 0x01; /* enable PIT channel 0 interrupt */
PITTF = 0x01; /* clear PIT interrupt */
PITMTLD0 = 0x02; /* MT0 load value (divides bus clock) */
PITLD0 = 0X0001; /* T0 load value (5 ms) */
PITCFLMT |= 0x80;
} /********************************************************/ /*********************** main *********************************/ void main(void)
{
DDRM=0XFF;
PTM=0x00;
SetupPITimer();
EnableInterrupts;
for(;;)
{
}
} /********************************************************/ /* interrupt handler for PIT 0 */
#pragma CODE_SEG __NEAR_SEG NON_BANKED void interrupt 73 ISR_PIT0(void)
{
PITINTE &= 0xfe;
PITTF |= 0x01;
PTM=~PTM;
}
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