After having programmed a 16F88 several times succesfully, all of a 
sudden it refuses to be reprogrammed and erased. It doesn't even return 
its device-ID (via the Wisp628 I see '3FFF').
I didn't change any hardware, only the program (not the config word).
I moved the chip to anoterh board but it keeps this behaviour, while 
other chips work fine (I tried only a read!) on both boards.

Maybe important: I have set RA5/MCRL to digital I/O (bit 5 of the config 
word is 0). But I don't think this chip has the 'Vpp-before-Vdd' 
requirement (I didn't read it in the programming specs). Anayway 
reprogramming worked fine before without it. Nevertheless I inserted 
Wouters 'dongle' between Wisp628 and target board, but that made no 
difference.

Is it possible to hurt a (16F88) PIC by reprogramming such that it dies, 
or at least behaves like it is dead?

I don't want to kill more 16F88s, so I didn't try another one yet.

Regards, Rob.


-- 
Rob Hamerling, Vianen, NL phone +31-347-322822
homepage: http://www.robh.nl/
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