Updating HPWM frequently, safe?

[mister_e]

first you'll have to match the calc values to suit your need. With your current code example (which seems to be one of mine, the calc will give you...
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look at this section of the code

        duty = 52                           ' duty value for 50% duty cycle
        PR2 = 25                            '
        T2CON = %00000100                   ' timer2 on, prescale 1:1
        CCPR1L = duty>>2                    ' MSB of duty cycle value
        CCP1CON=%00001100 | (dUTY<<5)       ' set PWM mode and store the 
                                            '   2 LSB of duty

52 is showned in the result section and it's to set the duty cycle to 50% as selected in the duty cyle section.

Now if you want to update the duty cycle, you could use this section

        CCPR1L = duty>>2                    ' MSB of duty cycle value
        CCP1CON=%00001100 | (dUTY<<5)       ' set PWM mode and store the 
                                            '   2 LSB of duty

in your code you just need to change the value of Duty variable.

The example was for a 16F877, you should have a look at the 12F683 to see if they work the same way.

post your whole code, maybe some register need to be set in a different way. I'll put some effort and open my datasheet as well