Hi All,

This is my first time posting here.  I have been designing a countdown
timer that uses a PIC16F872 running at 4 Mhz.  It allows the user to
enter in a time in seconds ranging from 00.0 to 99.9, and then press a
button to start a countdown.  The code uses Timer0 with a pre-scaler
of 1:8 set to 133 so that it interrupts every 10 ms.  Every ten
interrupts, it calls a function that 'clocks' a tenth of a second.  In
the meantime, the chip is continuously outputting the current value
for time.  My issue is that while the countdown works flawlessly, I
can't get any button input on PORTB.  However, when I comment out my
timer0 interrupt routine, and the statement where I enable the timer0
interrupt initially, the button input works just fine.

I'm writing this in C using the CCS complier but I could definitely
rewrite in using the PICC-Lite compiler if it would help.

Any help would greatly be appreciated as I'm stumped!

Thanks!
-- 
-Erik J. Reynolds
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist