Pwm 16f628

**CocaColaKid** · - 21st September 2005, 20:27

First there is no RB8, there is a RB7 though which is the 8th bit.

Are you reading a DIP switch or something?

**CocaColaKid** · - 21st September 2005, 20:53

I would read the port by using:

Code:

pwm_value.0 = portb.4
pwm_value.1 = portb.5
pwm_value.2 = portb.6
pwm_value.3 = portb.7

This will load the value between 0-15 in the byte sized variable pwm_value. If your running @ 4 MHz then you could use:

Code:

pwm portb.0,127,60

This would give you a 50% duty cycle for about 300ms out on portb.0. Or you can use the hardware PWM which is on portb.3.

mladenovic · - 21st September 2005, 21:05

Hi
Thanks for help.
Those 4 bits I get from PC parallel port.
I would like to know how to use HPWM?
Milan

**CocaColaKid** · - 21st September 2005, 21:16

I think about the only thing you have to do is:

Code:

    hpwm 0,pwm_value,32767
    pause 300
    CCP1CON = 0

The first line starts the PWM at whatever value is stored in the pwm_variable at 32.767kHz. It then pauses for 300ms then turns off the HPWM.

Thread: Pwm 16f628