Erase requires a pretty accurate VDD supply, for that
chip 4.75-5.25V. You can program at less voltage OK,
but not erase.

--Bob
 
csb wrote:

>Hello,
>Does anyone use DL4YHF's winpic software to program 16f pics? I have a curious problem, and I can't fix it...
>
>I built my own programmer, based on a 74ACT125 tri-state buffer (to disable the data out to let the PIC read back to the PC). I can program 16f84As, I can read & verify them, but it seems like the Erase function doesn't work. For example: I load a hex file, program the pic, verify it. Then , I erase. After that, a blank check tells me that nothing is blank (except EEPROM data mem). so I read-back the pic, and the old hex file is there!
>
>I'd be tempted to blame the erasing algorithm (easy), but where else can the problem be? It seems my programmer works, unless erasing the pic works in a completely different way than programming it. I have access to a 2-channel DSO, so I can do a few tests.
>
>Please help,
>Christian
>
>
>  
>


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