Timers and Internal interruptions on C51

#1 · June 8, 2024, 10:48 pm

Hi,

I've got som trouble while programming in C51 the atmel 8051 uC. When it comes to using timers, I am not able to jump into the interruption, i am not sure if the simulator is able to simulate interruptions of timers overflow:

#include <reg51.h>	

sbit Tuds=P2^1;
sbit Tdec=P2^2;
sbit Tcent=P2^3;
unsigned int cont_interrupt;

void delay_ms(unsigned int ms){
    unsigned int i;
    unsigned char j;

    for(i=1; i<ms; i++)
    {
        for(j=1; j<126; j++)
        {
        }
    }
}

void visualizacion(unsigned int number){
    unsigned char decena;
    unsigned char unidad;
    unsigned char centena;

    unidad=number%10;
    decena=(number/10)%10;
    centena=(number/100)%10;

    P2 = unidad|0x20 ;
    delay_ms(5);

    P2 = decena|0x40;
    delay_ms(5);

    P2 = centena|0x10;
    delay_ms(5);
}

void RSI_tempo() interrupt 1{
		TH1=0xD8;
        TL1=0xF0;//10000us=10us=0.01s
        cont_interrupt+=1;
}

void main(){
    IE=0x8A;
    TMOD=0x15; //0001 0101 de esta manera el timer 0 esta como contador de eventos y el timer 1 como temporizador
    //Configuraion del timer 1 como temporizador
    TH1=0xD8;
    TL1=0xF0;//10000us=10us=0.01s
    
    //configuracion del timer 0 como contador de eventos
    TH0=0x00;
    TL0=0x00;
    
	TR1=1;
	TR0=1;
	cont_interrupt=0;

    P2=0x00;

    while(1){
			if (cont_interrupt == 1000){
                cont_interrupt=0;
                visualizacion(123);
            }
    }
}

The circuit is the microcontroler with a multiplexed seven segment using a bcd to seven segment decoder.

Some help would be gratefull 🙂

#2 · June 9, 2024, 1:32 pm

Hi, thanks for reporting.

It's important to know which version of simulide are you using.

And I can't test your code, no idea which compiler is that and no .hex and circuit files.

The simulator can simulate interrupts.