Port Variables act like Constants

[Darrel Taylor]

Look in the .bas file for the chip you are using.
If it's a 16F877A then open c:\pbp\16f877a.bas

The PORTL and PORTH aliases are used for the PIN numbers (0-15)
PORTL is 0-7 and PORTH is 8-15.

PORTL   VAR     PORTB
PORTH   VAR     PORTC
TRISL   VAR     TRISB
TRISH   VAR     TRISC

If PORTH is aliased to PORTC then you don't need to do anything.
If it's not, change it to PORTC, and change TRISH to alias TRISC.

Then you can use the PIN numbers to access the pins with a variable.

    If DS1=1 then
	ComVar=14   ; PORTC.6
	Else
	ComVar=13   ; PORTC.5
    EndIF

    Serout2 ComVar, 84, [“  Com is PIN - ”, DEC ComVar,13,10]

[MOUNTAIN747]

Darrel,
Thanks again, you make it look so easy! After two days of working with this I now know I was searching for the wrong topics. I haven’t found anything about the .bas file in the manual. I think this subject deserves a WiKi along side your other documents.

By the way, to those who had a hand in creating the Wiki and those who maintain it, ITS GREAT!