Harry Mueller <hgmueller <at> mts.net> writes:

> I'm got functions for the following:
> 
> 1. A gyro input. I use timer_o to create a 1500 uS pulse.
> 2. A gyro output. I use CCP_2 to get the duty cycle.
> 3. Accelerometer output.  I use CCP_1 to get the duty cycle.
> 4. PWM for 2 motors. I previously used CCP_1 and CCP_2 for these.
> 5. I have a future need for a timing cycle for 2 wheel encoders.
> 
> I think I can use timer_2 for function 5. but obviously I can't do 4. with
> 2. & 3. 
> 
> Any suggestions?

Try PIC18F2431 - it has more timers and designed for motor control.  I believe 
it has up to 4 PWM. 

If you have to stick with F877: 
1. leave it on TMR0
2, 3, 5: if ~ 10us resolution is OK you can set up timing loop. Alternatively 
use PORTB interrupt on change to capture timing
4. Use hardware PWM.

Sergey



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