Darrel's Multiple Software PWM

[paul borgmeier]

Are the two fequencies always a factor of 2X apart? (10kHz and 20kHz)
What else does this PIC need to do?
Do the two PWM need to be in phase?

[Sean_Goddard]

PWM and maybe a programmable divider OR a divider and a MUX to select the appropriate frequency multiple.

Whats your application btw please??

[passion1]

Thank you guys.
I got the following clever code from MeLabs support, that solves my problem. It produce simultaneous frequencies of 20KHz, 10KHz, and 5KHz:

DEFINE OSC 20 ' Use a 20MHz crystal for best results

freq_delay VAR WORD

freq_delay = 25 ' 25uS for 20KHz top frequency ((1/20K)/2)
TRISB = %11111000 ' freq pins to outputs

' Output 20KHz on RB0, 10KHz on RB1, 5KHz on RB2
' Adjust freq_delay to compensate for loop overhead
loop:
PAUSEUS freq_delay
PORTB = (PORTB & %00000111) + 1 ' count binary 000 to 111
GOTO loop