|
Changing
Direction
Page 31
INDEX
Any of the lines of a PIC chip can be changed from Input to Output or vice
versa, during the running of a program. This makes the chip very versatile however
there are a number of limitations you must take into account before performing
this operation.
The limitations are all hardware.
Before changing the direction of a line you need to work out which line will be
the easiest to work with.
You must remember that both the input and output hardware will be connected to
the line at all times and these items must not interfere with the operation of
the circuit in any way.
A fair amount of technical expertise is needed to understand the consequences
of interference, both at the DC level and AC level.
NEXT
|