Hi Uaca,

How do you have the chip connected externally? Do you have a pull-up
on MCLR? It sounds a bit like the classic MCLR floating (unconnected)
problem.

Sean


On Wed, Jun 17, 2009 at 11:47 PM, uaca man <uacaman@gmail.com> wrote:
>
> As meny other i'm starting with PICs, i bought some pic 12f629 and im usi=
ng
> some C code exemplas that i found on the net.
>
> I'm sure it was asked many times before but i can't understand what is
> wrong.
>
> So far i'm able to turn on the led but there is no way to make it flash.
>
> I'm using the HI-TECH C ide with the PIC10/12/16 MCU family compiler v 9.=
65
> and seems that im cursed, some times the led turns on, some times it just
> does nothing until i come close to the PCB and than it turns on just like=
 a
> miracle.
>
>
> The code i'm using:
>
> #include <htc.h>
>
> #define _XTAL_FREQ =A04000000 =A0 =A0 // oscillator frequency for _delay()
>
> // Config: ext reset, no code protect, no brownout detect, no watchdog,
> // =A0 =A0 =A0 =A0 power-up timer enabled, 4MHz int clock
> __CONFIG(MCLREN & UNPROTECT & BORDIS & WDTDIS & PWRTEN & INTIO);
>
>
> void main()
> {
> =A0 =A0unsigned char =A0 dcnt; =A0 =A0 =A0 // delay counter
>
> =A0 =A0// Initialisation
> =A0 =A0TRISIO =3D ~(1<<1); =A0 =A0 =A0 =A0 =A0 // configure GP1 (only) as=
 an output
>
> =A0 =A0// Main loop
> =A0 =A0for (;;) {
> =A0 =A0 =A0 =A0// turn on LED on GP1
> =A0 =A0 =A0 =A0GPIO1 =3D 1;
>
> =A0 =A0 =A0 =A0// stay on for 200ms
> =A0 =A0 =A0 =A0__delay_ms(100);
> =A0 =A0 =A0 =A0__delay_ms(100);
>
> =A0 =A0 =A0 =A0// turn off LED on GP1
> =A0 =A0 =A0 =A0GPIO1 =3D 0;
>
> =A0 =A0 =A0 =A0// stay off for 800ms
> =A0 =A0 =A0 =A0for (dcnt =3D 0; dcnt < 8; dcnt++) {
> =A0 =A0 =A0 =A0 =A0 =A0__delay_ms(100);
> =A0 =A0 =A0 =A0}
> =A0 =A0} =A0 // repeat forever
> }
>
> Any ideas on how to find the problem is greatly apreciatted
>
> Tks
> Uaca
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