12F629 clock-out not working

[johnl1]

No clock out and needless to say the LED doesn't flash either.

Any ideas would be appreciated.

PCW Compiler version 3.139


#include <12F629.h>
#include <stdlib.h>
#define BUZZER PIN_A1

#fuses INTRC, NOWDT,NOCPD,NOPROTECT,MCLR, NOPUT,NOBROWNOUT,NOSTVREN
#use delay(clock=4000000)
#byte CMCON=0X19
main()
{
set_tris_a(0);
setup_comparator(nc_nc_nc_nc);
CMCON=7;

while(1){
output_high(BUZZER);
delay_ms(200);
output_low(BUZZER);
delay_ms(200);
}
}

[PCM programmer]

When I get into the company tomorrow, I'll install your version of
the compiler and test it with a 12F629. That is, if you haven't
solved the problem before then.

[languer]

I could not get your program to compile. The fuse statement NOSTVREN, does not relate to anything. The following code does compile and works (on 3.164 and 3.184):

[johnl]

languer,

I tried your code and still no LED output.

Could you please send me the HEX file?

If that works I can conclude it's my compiler version, unless PCM Progammer tells me it's not after he tries it.

Thanks much.

Johnl

PS Not sure what the problem with the NOSTVREN fuse is. It is listed in the header file. Maybe it was removed in your later compiler version(?)

//////// Standard Header file for the PIC12F629 device ////////////////
#device PIC12F629
#nolist
//////// Program memory: 1024x14 Data RAM: 64 Stack: 8
//////// I/O: 6 Analog Pins: 0
//////// Data EEPROM: 128
//////// C Scratch area: 20 ID Location: 2000
//////// Oscilator Calibration Address: 90
//////// Fuses: LP,XT,INTRC,HS,NOWDT,WDT,CPD,NOCPD,PROTECT,NOPROTECT,NOMCLR
//////// Fuses: MCLR,PUT,NOPUT,RC,EC,RC_IO,INTRC_IO,BROWNOUT,NOBROWNOUT
//////// Fuses: NOSTVREN,NOSTVREN

[ckielstra]

[PCM programmer]

I removed NOSTVREN from the end of your #fuses statement
and compiled your program with PCM vs. 3.139.

It works OK.

Here are the signals on each pin:

Pin 7 -- High level
Pin 6 -- 2.5 Hz square wave
Pin 5 -- Low level
Pin 3 -- 1 MHz square wave
Pin 2 -- High level

I wonder what programmer you're using ? Is it possible that
you have accidently erased the Oscillator Calibration value at
address 0x3FF ? To check this, read the chip, and then view
the Program Memory. At the last address in the chip, you should
see something like this:

[Johnl1]

PCM Programmer,

When I read the chip, I did see the oscillator calibration value there, but still the chip did not work. But when I switched from my Pro Mate II programmer to the ICD2, the chip worked.

The only thing different since the last time I programmed 'F629s is a newer version of MPLAB.

So for now I can get the job done, although with serial programming, I cannot seem to use the MCLR pin as an input (MPLAB gives an error message if the NOMCLR fuse is set.)

Many thanks to you and the others who helped.

Johnl