Timer 0 trouble (PIC16F628)

[khansaab21]

Hello guys. A simple routine to utilize interrupt of timer 0 every 444 uSec isnt working. Following is the code. Could anyone plz help with trouble shooting it as after hours of wasting time on it I couldnt find fault.

Crystal = 4.194304 Mhz

void interrupt()
{
INTCON.T0IF = 0;
TMR0 = 227;
PORTA.F0 = ~PORTA.F0;
}

void main()
{
TRISA.F0 = 0; // Port A is output
TMR0 = 227;
INTCON = 0xA0;
OPTION_REG = 0x03; //Using prescaler of 16
for(;;
}

 

[daviddlc]

You still need to configure the global and device interrupts. Something like:

//***INTERRUPT ENABLING ***//
RCIE = 1; //Enable interrupt
PEIE = 1; //Enable device interrupt
GIE = 1; //Enable Global interrupt

//***Timer 1 initialization***// //To wait around 60 mSec before checking for the motor protection circuit
TMR1CS = 0; //Internal clock used for the timer FOSC/4
TMR1IE = 1; //Timer 1 Interrupt enabled

Also you need to start the timer:

TMR1L = 0xA0; //Init value for Counter
TMR1H = 0xEC; //Init value for Counter
TMR1ON = 1; //Start timer

 

[khansaab21]

As a matter of fact sir, i have enabled the interrupts and have to use timer 0 only because using a prescaler of 16 would give me the minimum timing error in the subsequent task upon the interruption.

Can somebody plz post a working C code of using timer 0 of pic 16f628 using a prescaler.

 

[vijay s]

i hope you are checking the working of interrupt with Bit Toggling PORTA pin

PORTA.F0 = ~PORTA.F0;

~ is for byte toggling... for bit toggling use !

PORTA.F0 = ! PORTA.F0;

please reply whether this solved ur problem...

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click helped button if this solves ur problem