Programming ultimatum

Nigel Goodwin · Oct 1, 2011

AGCB said:
What are the advantages to this? Sounds like more work.

The advantage is that you're not struggling for spare I/O, so you can leave the programming/debugging pins used for just that function.

As long as you use the same series of PIC (16F etc.) it's trivial to switch to your original target processor after debugging - it's particularly common on small devices like the 16F508 etc. where pins are seriously at a premium.

Mr RB · Oct 4, 2011

I'm not sure if anyone already mentioned this but the PGD and PGC pins can be left connected to your circuitry while you program the chip in-circuit and no switch is needed.

However for this to work you need to make sure the PGD and PGC pins are not connected to something like a capacitor. Generally if they are connected to your circuitry through a resistor of 2k2 (or higher) there should be no problem with ICSP while leaving those pins connected to the circuitry.

AGCB · Oct 5, 2011

Mr RB said:
I'm not sure if anyone already mentioned this but the PGD and PGC pins can be left connected to your circuitry while you program the chip in-circuit and no switch is needed.

However for this to work you need to make sure the PGD and PGC pins are not connected to something like a capacitor. Generally if they are connected to your circuitry through a resistor of 2k2 (or higher) there should be no problem with ICSP while leaving those pins connected to the circuitry.

I generally have PORTB conected to LEDs or 7 segment through 560 ohm resistors so that will not work then, am I right. I've used a multi pole switch to move the programmer in and out of the circuit and this is working fine so guess I'll keep doing it this way.
Thasnks Aaron

Programming ultimatum

Nigel Goodwin

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Mr RB

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AGCB

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Programming ultimatum

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