In article ,
Tim Wescott wrote:

Can someone with experience with the part tell me if there are
sufficient differences between the PIC 16F84 and the 16F84A to cause
problems during EEPROM write?

I suggest you go right to the horses's mouth: the 84-84A migration
guide is at http://ww1.microchip.com/downloads/e...Doc/30072b.pdf

It looks to me as if there are some voltage, and timing differences
involving access to the EEPROM. Dunno whether that's the cause of
your lockups, though.

http://ww1.microchip.com/downloads/e...Doc/80083b.pdf is the
16F84A errata document.

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Dave Platt AE6EO
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