Just have a counter in the interrupt routine that won't act until you get to
.250

-----Original Message-----
From: David Dunn [mailto:ddunn@TCAINTERNET.COM]
Sent: Monday, June 11, 2001 10:56 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: timers


16F877 chip @ 4 Mhz

i'm considering using the timers in a project .. what i'd like is an
interrupt every .250 seconds

i'm already using timer2 for PWM
i'd *like* to use timer1 for a counter

somebody check my math for me please :

timer0 runs at 1 Mhz (Fosc/4) ..

most prescale you can get is 256 ..

8 bit counter ..


working all this out, the *slowest* i can get timer0 to run (on my
calculator) is .065536 seconds

is this right ?

thanks,

david dunn

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