First off, hello all!  I'm new to the piclist, but
have read SEVERAL pages over these last few weeks.
This place seems like a GREAT resource for resolving
PIC problem ... but I haven't seen anything addressing
my situation (maybe I'm strange).

What I'm working on is multiplexing 5 7-segment
displays using a 16F84.  I'm using 7 I/O pins for the
segments, and 5 more pins to enable each (through a
transistors, to tie the common cathode to ground).  My
problem is that I'm trying to do it as follows:

I have a variable defined in the top of the program:

DispNum EQU             0x10            ; selected display variable

Of course, I have lines of code to set the output
pins, clear them all, etc.  Down in the body of the
code (where I want to use the variable), I have this
within a loop:

movwf PortB                     ; Now, display the new
                                  digit
bsf PortA,DispNum               ; Enable the next
                                  display
call Delay1                     ; Execute a delay
bcf PortA,DispNum               ; Disable the display

My reasoning for doing this is because I'm more
familiar with BASIC than Assembly (although I am
learning).  I don't want to use a constant for the
pin number because the pin number changes each loop
cycle.  So PortA,1 will light on one cycle, PortA,2 on
the next, etc.  Each time the loop count increments, I
want the DispNum variable to increment, and address
the pin number to be active.

When I assemble it, I get no errors.  But when I
simulate it, PortA pin one is the only one that goes
high (not sure why).  I've tried changing the
declaration statement to #DEFINE and #DECLARE, but
haven't gotten either to work.  Can anyone tell me how
to declare a variable, so that I can use the
value stored IN the variable in the above lines of
code?  Please? ...

Thanks for your time,


Allen T. Mahurin (ATM)

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