Hi guys,

I'm in need of some advice regarding multiplexing seven seg
displays. I have 4 displays on 12 i/o pins, and have two
concerns:

1) Visibility.
        What is the optimum "on time" vs "off time" for best
visibility, while at the same time having enough remaning cpu
time to be able to handle various other tasks?

2) Current consumption.
        How do I determine how much current the leds are going to
need, and how can I keep these values w/in the current specs of
the pic?  All the microchip literature seems to suggest that you
can drive leds directly. I've been doing it that way but have a
feeling I've been exceeding current specs on the i/o ports.


Thanks for any help! :)

-Shane.