At 01:39 PM 10/13/99 +1000, you wrote:
>At 12:13 12/10/99 -0700, you wrote:
>>At 02:14 PM 10/12/99 -0400, you wrote:
>>>>chip has 2 Vdd pins and 2 Vss pins. Does it matter which ones I use? (My
>>>

......

>>-Erik Reikes
>
>The parallax programmer unfortunately sources the VDD though a single I/O pin
>of the PIC firmware chip. There is no transistor/FET buffering and if you
>look at the programming specs you will see that this condition is way out of
>spec. Personally, I could not trust the parallax programmer to reliably
>program (I.E. over time) the flash parts however you can always power the
>target circuit to supply the 5V (as it seems you are planning) and get around
>this problem.
>
>More important to note is that if the LVP pin is raised simultaneously with
>VDD, the flash parts lock-up and you cannot enter the program mode. There
>must
>be a delay before raising LVP. This can be done with a simple RC network
>as done on the PROPIC II programmer.
>
>If you are powering the DUT from the target board then I would think that
>connecting the programmer's switched VDD to the LVP would work and solve both
>problems together.
>

Wups... Just saw this message before I posted my last (now obsolete)
question.  I will try delaying the tying of the LVP pin high.  I don't plan
to use the parallax programmer for production, it just happens to be the
only one I currently have.

Thanks for the advice.

-Erik Reikes