PWM PIN(S), DUTY, CYCLE ?Plural possible?

[Charles Linquis]

This is probably a silly question, but if you are attempting to drive two pins with the same signal, at the same time and the same phase, why do you need TWO pins?

[earltyso]

As I stated, I am driving 2 seperate h-bridges...each bridge has 2 inputs. I have a total of 4 inputs to both h-bridges and want to always drive 2 pins at any one time.
if I want my robot to turn right I need to drive

'ex: not actual code...

rightwheelfw var portb.0
rightwheelrs var portb.1
leftwheelfw var portb.2
leftwheelrs var portb.3

turnright:
high rightwheelrs
high leftwheelfw
pause 50
goto commands

turnleft:
high rightwheelfw
high leftwheelrs
pause 50
goto commands


In my case though I want to have variable speed control not just HIGH.
This is why I want PWM on 2 pins at the same time.

[mister_e]

there's some PIC which give you 2 different CCP module and allow that.

There's also some PIC with ECCP (even a 12F615), which can be used to drive in half bridge/Full bridge mode + few feature such as dead band time. 18F2431/4431 are some good example.
http://ww1.microchip.com/downloads/e...Doc/39616C.pdf

depending your expected PWM frequency, Darrel's Muti_SPWM could be used
http://www.pbpgroup.com/modules/wfse...p?articleid=12

Timer interrupt is another way to go.