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Program seems to "fly" off the chip

 
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Sophi



Joined: 14 Jun 2005
Posts: 64

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Program seems to "fly" off the chip
PostPosted: Sat Feb 18, 2006 9:24 am     Reply with quote
This has been an intermittant problem that I've seen now with two unrelated projects (different boards, PICs and software).
I program the chip- 16F877A with ICProg, the chip works for a long while. Then I make some wiring change to the circuitry, yes, while the power is off, and no more code in the chip.
BTW when I reprogram everything is fine again.
What's up with that? Is there a reset in the chip that I'm hitting with my soldering iron?
Thanks in advance-
SophE
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Sat Feb 18, 2006 9:42 am     Reply with quote
Check that you have LVP disabled or, if LVP is required, ensure the LVP enable PIN is not floating. Static voltage around a circuit with LVP enabled and the LVP Enable pin not having a low enough termination resistance can put the PIC into program mode. In my opinion the LVP implementation is flawed with PICs
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