Hi there

I would just like some opinions on this. Does this
solve the read-modify-write problem.

All PIC pins have external pull-ups.  When the program
starts the instruction CLRF PORTX is issued to write a
logic '0' to the data latch.  If you want a logic '1' on the
port you simply make it an input, by writing a '1' in the
TRISX register corresponding to the bit position.
If you want a logic '0' you make the port pin an output and as
the data latch already contains a '0' you know that the pin
will pull the external pull-up to ground.

You no longer read and modify the PORT, but rather the
TRIS register for that port.

Any thoughts on this method?

Regards

Gavin
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vulcan@ihug.co.nz
http://www.geocities.com/TheTropics/Cabana/2625
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