Two ideas:

1: Don't output the bits for each PWM one at a time. Instead  accumulate 
them into a single byte of memory using an rrf or rlf instruction, then just 
copy that byte to the output.


2: Use the following  (warning: untested code!)

    movlw    8
    movwf    pwm_count
    movlw    1
    movwf    bit_mask
pwm_loop:

    ....

; to turn on the bit:

    movf    bit_mask,w
    iorwf    portb,w
    movwf  portb

; to turn off the bit

    comf    bit_mask,w
    andwf   portb,w
    movwf   portb

    rlf        bit_mask,f
    decfsnz pwm_count,f
    goto    pwm_loop

Bob Ammerman
RAm Systems


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