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Interrupts on PIC12F609

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shaunak_s

Joined: 04 Jan 2011
Posts: 3

Interrupts on PIC12F609

Posted: Fri Apr 29, 2011 5:44 am

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Hi,
We are currently using the midrange micro PIC12F609. I used the PCWHD wizard to generate a small code that enabled the timer0 interrupt. But this does not seem to be working. Please could you help me out. The code is as below

Code:

#include <12F609.h>

#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES IOSC4 //INTOSC speed 4 MHz
#FUSES NOBROWNOUT //No brownout reset

#use delay(int=4000000)
#byte STATUS = 0x03
#bit REG_BANK = 0x03.5
#byte OPTION_REG = 0x81

#define LED PIN_A1
#define DELAY 1000
#define MAX_SLEEP_CNT 1

int8 Sleep_Counter = 0;

#int_TIMER0
void TIMER0_isr(void)
{
Sleep_Counter = 1;
}

void main()
{
int8 Toggle = 0;

setup_timer_0( RTCC_INTERNAL | RTCC_DIV_256 | RTCC_8_bit );
setup_comparator( NC_NC_NC_NC );// This device COMP currently not supported by the PICWizard
enable_interrupts( INT_TIMER0 );
enable_interrupts( GLOBAL );

//Example blinking LED program
while(true){
   if( Sleep_Counter ) {
      Sleep_Counter = 0;
      if( Toggle ) {
         Toggle = 0;
         output_low(LED);
      }
         else {
            Toggle = 1;
         output_high(LED);
      }
   }

}
}

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Sun May 01, 2011 6:25 pm

Reply with quote

Try a more simple program, and use Pin A5 for the LED. See if it works.

Your LED circuit should look like this:

Code:

pin 330 ohms LED
A5 ---/\/\/\/------->|----
|
|
----- Ground
---
-

You can use a different resistor value if you don't have 330 ohms.
You could use 220 ohms or 470 ohms.

Here is the test program:

Code:

#include <12F609.h>
#fuses INTRC_IO,IOSC4,NOWDT,NOBROWNOUT
#use delay(clock=4000000)

#define LED PIN_A5

#int_timer0
void timer0_isr(void)
{
output_toggle(LED); // Blink the LED
}

//===========================
void main()
{
setup_timer_0(RTCC_INTERNAL | RTCC_DIV_256);

enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL);

while(1);
}

If it doesn't work, post your compiler version.

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