STM8外部中断求助

只看该作者 · 2013-3-1 14:53

初涉STM8单片机，遇到问题：设置PB5下降沿中断，外接按键，按键按一次PC7上指示灯取反。
症状如下：
不按外部按键，系统一直处于等待状态，按外部按键进入中断，执行完中断函数后程序复位，是什么原因呢？请各位赐教

程序如下

main()
{
unsigned char n;
_asm("SIM");//disable interrupt
CLK_init();//设置HSI 16M
PB_DDR = 0x00;
PB_CR1 = 0x30;
PB_CR2 = 0x20;//PB5为中断上拉输入
EXTI_CR1 = 0x08;//pb口设置为仅下降沿触发
  EXTI_CR2 = 0x00;//其他端口中断
_asm("RIM");//enable interrupt
while (1){
      ;
}
}

中断函数
void PORTB_interrupt(void)
{
PC_ODR ^= 0X80;//外接LED指示灯
return;
}
//***************************************
extern void _stext();    /* startup routine */

struct interrupt_vector const _vectab[] = {
{0x82, (interrupt_handler_t)_stext}, /* reset */
{0x82, NonHandledInterrupt}, /* trap  */
{0x82, NonHandledInterrupt}, /* irq0  */
{0x82, NonHandledInterrupt}, /* irq1  */
{0x82, NonHandledInterrupt}, /* irq2  */
{0x82, NonHandledInterrupt}, /* irq3  */
{0x82, (interrupt_handler_t)PORTB_interrupt}, /* irq4  */
{0x82, NonHandledInterrupt}, /* irq5  */
{0x82, NonHandledInterrupt}, /* irq6  */
{0x82, NonHandledInterrupt}, /* irq7  */
{0x82, NonHandledInterrupt}, /* irq8  */
{0x82, NonHandledInterrupt}, /* irq9  */
{0x82, NonHandledInterrupt}, /* irq10 */
{0x82, NonHandledInterrupt}, /* irq11 */
{0x82, NonHandledInterrupt}, /* irq12 */
{0x82, NonHandledInterrupt}, /* irq13 */
{0x82, NonHandledInterrupt}, /* irq14 */
{0x82, NonHandledInterrupt}, /* irq15 */
{0x82, NonHandledInterrupt}, /* irq16 */
{0x82, NonHandledInterrupt}, /* irq17 */
{0x82, NonHandledInterrupt}, /* irq18 */
{0x82, NonHandledInterrupt}, /* irq19 */
{0x82, NonHandledInterrupt}, /* irq20 */
{0x82, NonHandledInterrupt}, /* irq21 */
{0x82, NonHandledInterrupt}, /* irq22 */
{0x82, NonHandledInterrupt}, /* irq23 */
{0x82, NonHandledInterrupt}, /* irq24 */
{0x82, NonHandledInterrupt}, /* irq25 */
{0x82, NonHandledInterrupt}, /* irq26 */
{0x82, NonHandledInterrupt}, /* irq27 */
{0x82, NonHandledInterrupt}, /* irq28 */
{0x82, NonHandledInterrupt}, /* irq29 */
};