FIQ interrupt of Sunplus 16-bit microcontroller

Function implementation: Open and set TimerA and TimerB timers, and turn on their FIQ interrupts. When there is a FIQ interrupt request from TimerA/B, respond to the corresponding interrupt service routine, and flip the I/O port output level in the interrupt service to control the on and off of the light-emitting diode connected to the I/O port. 

Experimental phenomenon: TimerA timing length is 2s. When entering the FIQ interrupt of TimerA, the output level of the lower four bits of IOA port is flipped to control the light-emitting diode connected to the lower four bits of IOA port; TimerB timing length is 1s. When entering the FIQ interrupt of TimerB, the output level of the lower four bits of IOB port is flipped to control the light-emitting diode connected to the lower four bits of IOB port. When the program is running, it can be observed that the light-emitting diode connected to the lower four bits of IOA port has a light-on and light-off cycle of 4s, while that connected to the lower four bits of IOB port is 2s.

 

 

 

#include "SPCE061A.H"
unsigned int n,Output1=0x00f0,Output2=0x000f;
void FIQ(void)__attribute__((ISR));
void FIQ()
{
    if(*P_INT_Ctrl&0x2000)//When it is a TimerA interrupt, it is b13
    {
        *P_INT_Clear = 0x2000;
        Output1^=0xffff;
        *P_IOA_Data = Output1;    
    }
    if(*P_INT_Ctrl&0x0800)//When the TimerB interrupt is 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; //1024HZ selected
    *P_TimerA_Data = 0xffff-2048;
    
    *P_TimerB_Ctrl = 0x0004; //4096 selected
    *P_TimerB_Data = 0xffff-4096;
    
    *P_INT_Ctrl = 0x2800;
    __asm( "FIQ ON");
    while(1)
    {
        *P_Watchdog_Clear = 0x0001;
    }
}