At 08:12 AM 7/26/96 +0000, Andre Abelian wrote:

>Are you using extended pics?
>end of pic16c54a/e      should be e letter
>e  is for 125 C.
>
>Hope this helps.
>
>Andre
>
>
>gary skinner wrote:
>>

>> Now we were testing another part of the project and are suddenly
>> seeing failure at temperatures of about 140 deg F.
>>
>> The main failure is that the RAM sems to be lost, or it could be that
>> the part somehow resets itself (and power up sequence resets the RAM)

As a aside, on reset I believe the PIC's retain there RAM contents. Hence,
if on 'reset' you are missing the RAM contents, your power up sequence is
initializing your RAM. This of course you control so you might be able
to re-write this to recover if this is what is happening. I believe there
is a M.C. APP note that uses this to its advantage to do a sort of software
watchdog/brownout type of circuit.

Of course, as Andre points out, if your exceeding the temperature limits
of the part, all bets are off.

Regards,

------------------------------------
| Jeff King      Aero Data Systems |
| jeff@mich.com  P.O. Box 510895   |
| (810)471-1787  Livonia, MI 48151 |
|F(810)471-0279  United States     |
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