Hi,

I'm using an m32c-87 that works in stop mode; I use this code to put the mcu in stop mode:

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rlvl |= 0x07;//RLVL -> Livello 7

int3ic &= 0xF8;
ifsr3 = 0;//one edge
int3ic &= 0xCF;//Edge sensitive (falling edge)
ir_int3ic = 0;
int3ic |= 0x01;//Interrupt INT3 abilitato;

int5ic &= 0xF8;
ifsr5 = 0;//one edge
int5ic &= 0xCF;//Edge sensitive (falling edge)
ir_int5ic = 0;
int5ic |= 0x02;//Interrupt INT5 abilitato;

while(1){
        //STOP MODE
        asm("fclr i");
        int3ic |= 0x07;//Interrupt uscita stop mode   
        int5ic |= 0x07;//Interrupt uscita stop mode
        //Settare, se presenti, i livelli degli interrupt non usati per l'uscita dallo stop mode a livello 0   
        asm("ldipl #2");//IPL -> Livello 2
        rlvl &= 0xFA;//RLVL -> Livello 2
        asm("fset i");
        prc0 = 1;
        cm10 = 1;
           
        apiDelay(1, Timer4msecDelay, 0x66);//routine that performs a delay oa about 100 msec
    };

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where I use two interrupts (INT3 and INT5) with two differents routines to exit of stop mode, doing some instructions, and coming back to the stop mode.

First of all I resolved to use only one interrupt (INT5) to exit the mcu of the stop mode, setting the INT3 interrupt pin to an high level (with a pull-up resistor).

Both the interrupt routines starts with:

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asm("nop");
    asm("nop");
    asm("nop");
    asm("nop");
    prc0 = 0;
    rlvl |= 0x07;//RLVL -> Livello 7

    asm("fclr i");

    prc0 = 1;
    mcd &= 0xE0;
    prc0 = 0;
    index = 0;
    while(index<1000){index++;}
    prc0 = 1;
    mcd |= 0x12;
    prc0 = 0;
    index = 0;
    while(index<1000){index++;}
       
    prc0 = 1;
    cm04 = 1;
    prc0 = 0;
    index = 0;
    while(index<1000){index++;}  

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but when the INT3 routine ends I note the ir_int5ic bit goes high also if it has been cleared when the routine started; for this reason the routine started again and only after two times, the routine stops and the mcu comes back in stop mode. I decided to manually clear this bit to the end of the routine to solve the problem, but I really don't understand where is the mistake; I have also used interrupt routines but I never have seen nothing like this...

Colud anyone help me ?

Kind regards

Davide Urbano