请版主一定要看，关于中断嵌套！ 嵌套, 版主

bozai020141

为了试验dg128中断嵌套，我编写了如下程序：
设置定时中断0、1、2，默认优先级。进入0定时中断后，我打开1定时中断，关闭2定时中断，并打开全局中断，然后做死循环；1定时中断服务程序每隔5000个定时计数器对PORTB_BIT0位取反；2定时器中断服务程序每隔7000个定时计数器对PORTA_BIT0位取反。
程序结果如我设想那样运行——PORTB_BIT0位不断在做取反运算，PORTA_BIT0位始终不变。
但我让程序运行了一会后，它自动停止了并报错：
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0xC0, Memory Address: 0x3FF.
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0x0, Memory Address: 0x3FD.
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0x0, Memory Address: 0x3FE.
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0xC0, Memory Address: 0x3FB.
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0x49, Memory Address: 0x3FC.
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0x1, Memory Address: 0x3F9.
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0x1B, Memory Address: 0x3FA.
FCS Warning (ID 25): writing to reserved register at pc = 0xc021. Value: 0xC0, Memory Address: 0x3F8.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3F8.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3F9.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3FA.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3FB.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3FC.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3FD.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3FE.
FCS Warning (ID 26): reading from reserved register at pc = 0xc035. Value: 0x0, Memory Address: 0x3FF.
FCS Warning (ID 26): reading from reserved register at pc = 0x1. Value: 0x0, Memory Address: 0x4. MEBI module is affected.
FCS Warning (ID 26): reading from reserved register at pc = 0x1. Value: 0x0, Memory Address: 0x5. MEBI module is affected.
ILLEGAL_BP

请问版主这是怎么回事呢？？

其次，版主在以前的帖子中提到，尽量不要用中断嵌套，说太占用资源，这是为什么？
谢谢！

bozai020141

程序如下

#include /* common defines and macros */
#include /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"


void Time_Init(void);


void main(void) {
DDRA=0x01;
DDRB=0x01;
Time_Init();

EnableInterrupts;

for(;;) {}

}


void Time_Init(void){
TSCR2=0x07;
TIOS=0xff; //定义time0到time3口为输入捕捉，time4到time7为输出比较
TIE=0x07; //打开time0,time1,time2中断
TSCR1=0x80; //时钟模块使能位；
TFLG1=0xFF; //清除标志位
TC1=TCNT+5000;
TC2=TCNT+7000;
}



#pragma CODE_SEG NON_BANKED
void interrupt 8 time0(void){

TFLG1=0x01; //清除标志位
TIE_C1I=1;
TIE_C2I=0;
EnableInterrupts;
for(;;){
;
}
// TIE_C2I=1;
}

#pragma CODE_SEG NON_BANKED
void interrupt 9 time1(void){
TFLG1=0x02;
TC1=TC1+5000;
PORTB_BIT0=~PORTB_BIT0;

}

#pragma CODE_SEG NON_BANKED
void interrupt 10 time2(void){
TFLG1=0x04;
TC2=TC2+7000;
PORTA_BIT0=~PORTA_BIT0;
}

bozai020141

那如果我一定要用中断嵌套的话，有没有解决办法啊？

还有，版主在以前的帖子中提到，尽量不要用中断嵌套，说太占用资源，这是为什么？

谢谢！

bozai020141

Thank you very much!