Did you RTFM (read the programming specificications) realy thouroghly?
For programming the 16F877A is a very different beast from the old PICs
(16F877, 16F628, 16x84).

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Rich Meston
> Sent: Saturday, April 05, 2003 9:30 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: 877A programmer, CP accidentaly enabled - how
> do I switch it off?!
>
>
> I'm having a real problem with a 16F877A.  I've used 877's
> without any problems, but this is a wierd one...
>
> I'm trying to make a programmer with a 16F84, and I've had it
> programming locations in the 877A, and doing a bulk erase of
> the program memory without any problems (so I know I have the
> programming voltages working, and I know I've got the
> timing/clock/data signals right).
>
> Here's the problem - I accidentaly switched the code
> protection on for both program and data.  Now when I execute
> a chip erase, it clears the config word, but it won't set the
> CP and CPD bits to 1 - so code protection is still on!
>
> I'm using LVP.  Everything was working OK until this
> (obviously now I can't program or verify anything!!).
>
> Any idea's welcome...
>
> Cheers
>
> Rich
>
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