凌阳16位单片机之FIQ中断

实验现象：TimerA定时长度为2s，当进入TimerA的FIQ中断后，翻转IOA口低四位的输出电平以控制接在IOA低四位端口的发光二极管；TimerB定时长度为1s，当进入TimerB的FIQ中断后，翻转IOB口低四位的输出电平以控制接在IOB低四位端口的发光二极管。程序运行时，可以观察到接在IOA低四位端口的发光二极管亮灭的周期为4s，而接在IOB低四位端口的为2s。

#include "SPCE061A.H"
unsigned int n,Output1=0x00f0,Output2=0x000f;
void FIQ(void)__attribute__((ISR));
void FIQ()
{
if(*P_INT_Ctrl&0x2000)//当是TimerA中断是b13
{
*P_INT_Clear = 0x2000;
Output1^=0xffff;
*P_IOA_Data = Output1;
}
if(*P_INT_Ctrl&0x0800)//当是TimerB中断是b11
{
*P_INT_Clear = 0x0800;
Output2^=0xffff;
*P_IOA_Data = Output2;
}
}
int main()
{
__asm("FIQ OFF");

*P_IOA_Dir = 0x00ff;
*P_IOA_Attrib = 0x00ff;
*P_IOA_Data = 0x0000;


*P_TimerA_Ctrl = 0x000d;//选择了1024HZ的
*P_TimerA_Data = 0xffff-2048;

*P_TimerB_Ctrl = 0x0004;//选择了4096的
*P_TimerB_Data = 0xffff-4096;

*P_INT_Ctrl = 0x2800;
__asm("FIQ ON");
while(1)
{
*P_Watchdog_Clear = 0x0001;
}
}