Newbie questions: TTL or CMOS?
Nathan Burnside email (remove spam text)
<x-flowed>Are the PIC I/O pins TTL or CMOS? The data sheets say that the PICs are
CMOS, but it also says the I/O pins have a TTL buffer. Does this mean that
I need to treat them strictly as TTL? What kind of situations can damage
the I/O pins on a PIC? (aside from the case of voltages over Vdd and under
Vss) If I set an output pin high when it is tied to ground, will it simply
source 20mA without damaging the chip, or will it cause a short to Vdd and
fry the chip? Thanks for your help.
See also: www.piclist.com/techref/microchip/begin.htm?key=pic
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