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Thread: F876 programming questions
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face BY : Mike Mansheim email (remove spam text)



>I activate VCC then a few 10's of millisecs later raise MCLR from ground
>to ~13V. That's all you need to do. The 72 osc clocks will relate to the
>reset feature in the chip. The OSC1 pin should be tied low (or high),
>and not left floating, before and during the programming process to stop
>any clock pulses incrementing the program counter.

Tony, thanks for the response.
When I do this "in-circuit", when I activate Vcc, MCLR will also rise to
Vcc.  Then I am raising MCLR from Vcc instead of from ground.  Also, since
the chip in installed on a target board, the OSC pins are hooked up, so I
would think the chip would actually "run" for the period of time between
activating Vcc and raising MCLR.  This is the mode of operation I'm trying
to get a handle on.
Thanks again for the help.

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