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'[PICLIST] Dead 16F877?'
2001\07\19@160724 by Michael A. Powers

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Hello,

I've been having some problems with a 16F877 I have, it simply doesn't work.  The program I have it running is trivial for diagnostic purposes, just turn on a LED on RB5 with a pull-up resistor.  My tests have shown that although RB5 is low, it must be tristated because it cannot sink any current.  RB5 (or any other I/O pin for that matter) is incapable of going high as well. I have not be able to ascertain much more than that about the problem, because the chip behaves the same whether power is applied or not!  I have connected 11 and 32 to +5 and 12 and 31 to GND, but surprisingly the presence or absence of these connections does not seem to have any effect on the output,  which makes me suspicious of the fact that the chip is dead.  It is brand new, although I have not used it before.  Does anyone have any suggestions?

Thanks,
-Mike

P.S. I am not sure if the caps on the crystal meet the spec exactly, but it works fine on a 16F84.

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2001\07\19@162426 by Dipperstein, Michael

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Does the chip consume any current?

Does the oscillator oscillate?

-Mike

-----Original Message-----
From: Michael A. Powers [.....mapowersKILLspamspam@spam@email.com]
Sent: Thursday, July 19, 2001 1:07 PM
To: PICLISTspamKILLspammitvma.mit.edu
Subject: Dead 16F877?


Hello,

I've been having some problems with a 16F877 I have, it simply doesn't work.
The program I have it running is trivial for diagnostic purposes, just turn on a
LED on RB5 with a pull-up resistor.  My tests have shown that although RB5 is
low, it must be tristated because it cannot sink any current.  RB5 (or any other
I/O pin for that matter) is incapable of going high as well. I have not be able
to ascertain much more than that about the problem, because the chip behaves the
same whether power is applied or not!  I have connected 11 and 32 to +5 and 12
and 31 to GND, but surprisingly the presence or absence of these connections
does not seem to have any effect on the output,  which makes me suspicious of
the fact that the chip is dead.  It is brand new, although I have not used it
before.  Does anyone have any suggestions?

Thanks,
-Mike

P.S. I am not sure if the caps on the crystal meet the spec exactly, but it
works fine on a 16F84.

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