Are ports RA4 and RA5 on 16C73 'Special' ?
Dr. Imre Bartfai email (remove spam text)
RA4 is special for output as it is OPEN COLLECTOR rather than any other
output configured pins which are TOTEM POLE. This means it is not possible
to drive high by RA4. Maybe you should use a pullup resistor to do this.
I hope this helps.
P.S. It is a well-know RTFM fact, however, most people tends to forget it
On Wed, 21 Apr 1999, Jim Dolson wrote:
In reply to: <371DBCB7.9C60A6F8@iserv.net>
See also: www.piclist.com/techref/microchip/ios.htm?key=port
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