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I'm designing a board around a PIC18F6680, and the datasheets mention that programming can be done with only 2 pins. (PGC and PGD, although MCLR and GND are needed too). In a bunch of posts on here, people say that PGM needs to be grounded with a Resistor.
does it really need to be grounded, or can i use it as an I/O?
Yes it can be used as a regular I/O no problem, but this I/O have to be loaded while programming your PIC, unless you may have some programming errors. Sit 1 LED, LCD or whatever else solve problem in most cases. Case not, just add a 10-22K load to gnd.
Life will be good enough.
so i do need a load on it for programming?? can i have a resistor to ground and then still use it to control a RC servo? so i would be using a pulsout command on that pin. so something like this would work:
servo
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--------------PGM
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\
/
\
/
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GND
Yes indeed !
thanks, i will give that a try