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GPIO is an 6-bit wide, bi-directional port. The corre-
sponding data direction register is TRISIO. Setting a
TRISIO bit (= 1) will make the corresponding GPIO pin
an input (i.e., put the corresponding output driver in a
Hi-impedance mode). Clearing a TRISIO bit (= 0) will
make the corresponding GPIO pin an output (i.e., put
the contents of the output latch on the selected pin).
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The exception is GP3, which is input only and its
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TRISIO bit will always read as ‘1’. Example 3-1 shows
how to initialize GPIO.
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