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pic16f88 programming fail

I'm having problems programming a pic16f88.

I have a JDK type programmer (PG2 from Olimex) and am using WinPic (also tried ICProg but have removed it and drivers due to possible conflicts with WinPic).

The device simply seems to stay blank after programming. I've tried fiddling with the interface timing but to no avail.

Static tests show correct voltages on Vpp and Vcc.

I have had this programmer working just fine for a year or two with other pic devices (eg pic 16f870, 16f872 and 16f84) using ICProg.

Neither ICProg or WinPic will work with the 16f88 for me.

Any suggestions of what to start looking for?

Cheers Glenn

Reply to
Glenn
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Reply to
Tim Polmear

Does it with several devices. I think I have found the problem but am still checking to confirm. Take a look at this:

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I never would have thought of it - a very interesting little problem.

Cheers Glenn

Reply to
Glenn

Just dug out my old Tait style programmer. Guess what? It works perfectly. Since this programmer controls Vcc as well as Vpp, I believe the problem is the one described in the link above (I enabled the internal oscillator and disconnected MCLR through the config word).

Cheers Glenn

Reply to
Glenn

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