凌陽16位單片機(jī)之FIQ中斷

實(shí)驗(yàn)現(xiàn)象：TimerA定時(shí)長度為2s，當(dāng)進(jìn)入TimerA的FIQ中斷后，翻轉(zhuǎn)IOA口低四位的輸出電平以控制接在IOA低四位端口的發(fā)光二極管；TimerB定時(shí)長度為1s，當(dāng)進(jìn)入TimerB的FIQ中斷后，翻轉(zhuǎn)IOB口低四位的輸出電平以控制接在IOB低四位端口的發(fā)光二極管。程序運(yùn)行時(shí)，可以觀察到接在IOA低四位端口的發(fā)光二極管亮滅的周期為4s，而接在IOB低四位端口的為2s。

#include "SPCE061A.H"
unsigned int n,Output1=0x00f0,Output2=0x000f;
void FIQ(void)__attribute__((ISR));
void FIQ()
{
if(*P_INT_Ctrl&0x2000)//當(dāng)是TimerA中斷是b13
{
*P_INT_Clear = 0x2000;
Output1^=0xffff;
*P_IOA_Data = Output1;
}
if(*P_INT_Ctrl&0x0800)//當(dāng)是TimerB中斷是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;//選擇了1024HZ的
*P_TimerA_Data = 0xffff-2048;

*P_TimerB_Ctrl = 0x0004;//選擇了4096的
*P_TimerB_Data = 0xffff-4096;

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