Re: [Usbpicprog-technical] PIC16F876A fail to program

[Alexandre R. <ale...@gm...>]

Ok Frans, this explain that resistors (470R and 1k) I where trying to
figure out the function (a voltage divisor, I think). I will try the 100
Ohm resistor and give a feedback, thank you again.

On Wed, Apr 18, 2012 at 11:25 AM, Frans Schreuder
<fra...@gm...>wrote:

>  Ok, the difference is that the usbpicprog programmer has 470 Ohm
> resistors in series. If you don't use 3.3V devices, you can replace them
> with 100 Ohm. That will probably fix your problem.
>
> Kind regards,
>
> Frans Schreuder
>
>
> On 04/18/2012 04:18 PM, Alexandre Rosa wrote:
>
> Thanks Frans,
>
> I figured out the problem, in 876A project PGD and PGC pins were shared
> with an lcd bus lines so this should cause some interference in
> programming. What is strange is that PICKIT3  do the job with no problem.
> Any way thanks a lot.
>
> On Wed, Apr 18, 2012 at 5:12 AM, Frans Schreuder <fra...@gm...
> > wrote:
>
>>  Hello,
>>
>> The two devices use exactly the same algorithm and are also electrical
>> identical. I have programmed the 876A many times and never experienced this
>> behaviour.
>> Have you checked:
>>
>>    - your hardware voltages
>>    - all the connections to the 876A
>>    - that the PGM pin was connected to ground
>>
>> This could also be bad luck, you can try to request a free sample from
>> microchip to get yourself a new 16F876A
>>
>> Kind regards,
>>
>> Frans Schreuder
>>
>> On 04/17/2012 04:24 PM, Alexandre Rosa wrote:
>>
>>  Hey
>>
>> I have build a USBPICPROG through-hole version board and want to thank
>> you for the good job in this project.
>>
>> I was able to program a 16F877A without any problem but with a 16F876A
>> the programming has failed.
>>
>> 16/4/2012 13:50:32: Erasing before programming...
>> 16/4/2012 13:50:32: Erase OK
>> 16/4/2012 13:50:32: Programming the code area of the PIC...
>> 16/4/2012 13:51:05: Write Code memory OK
>> 16/4/2012 13:51:05: Programming the data area of the PIC...
>> 16/4/2012 13:51:05: Write Data memory OK
>> 16/4/2012 13:51:05: Verifying all areas of the PIC...
>> 16/4/2012 13:51:06: Verify code failed at 0x0. Read: 0xFF, Expected: 0x0A
>> 16/4/2012 13:51:06: Programming configuration area of the PIC...
>> 16/4/2012 13:51:06: Error programming config memory
>> 16/4/2012 13:51:06: Operations completed with errors/warnings
>>
>> In this case the 16F876A had been previous programmed with a PICKIT3 and
>> was erased or bad programmed by USBPICPROG and did not work after this try.
>>
>> I try an external 5V power supply to do the job of USB BUS supply with no
>> results.
>>
>> Any suggestions ?
>>
>>
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>
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