On Mon, Aug 05, 2002 at 09:10:33AM +1000, Tony Nixon wrote:
> Kieren Johnstone wrote:
>
> > * Turned on +12V, +5V (actually more like 3.6V - 3xAA rechargable), but programming datasheet says this is fine)
>
> Not sure I understand this. I thought the data sheet said 5V VDD should
> be used for programming mode.

Kieren has been reading the programming specification. It is possible to
program the 16F87X parts all the way down to 2.2V. However there is no
mechanism to do a bulk erase.

The problem is that the specification changes. And that's where he got bit.
FPP, picprg2.3d, and other 16F877 software programmers use the 5V algorithm,
and the first thing they do is bulk erase the part. But that's not a legal
operation on the 2.2V algorithm.

BAJ

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