Josh Koffman schreef op 20-Feb-15 om 11:02 PM:
> Hi all,
>
> I'm working on a design for the 18F25K22. Normally I like to dedicate
> my PGD/PGC pins to ICSP usage only. I also generally use external
> MCLR.
>
> However, I'm really short on pins. 3 pins actually. I know I can use
> PGD/PCG in circuit. I've never used them as inputs though. I realize I
> will probably have trouble actually using the switches assigned to
> them while debugging, but any other snafus? How do I provide for the
> possibility that the switch might be closed, pulling the pin to ground
> when I need to program/debug?

resistor between pin and switch, and connect the progger directly to the=20
pin. This way the progger can 'overrule' the switch.

>
> And how about an LED indicator on MCLR/RE0. Good or bad idea? Seems
> like it should be ok, but I wanted to check to be sure.

I think the LED will put too much load on the pin, so the progger won't=20
be able to raise it to Vpp level.

Wouter

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