18F4553 HPWM x2 problem

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  1. #1
    Join Date
    Feb 2018

    Default 18F4553 HPWM x2 problem


    I designed a board to use a 18F4553 and run two pulse output circuits on portc.1 and portc.2. I was intending to use HPWM1 and HPWM2 to vary the frequency of each independently. It looks like this cannot be done since both HPWMs need to have the same frequency. I need these two pulse outputs to be always on and running in the background. Are there any workarounds for this or does anyone know of another 44 TQFP PIC that would drop in and work? Duty cycle is not important, just independently adjustable frequency on two pins. Thanks for the help.

  2. #2
    Join Date
    Apr 2014

    Default Re: 18F4553 HPWM x2 problem

    Most of the newer PIC offerings have more than one Timer2/4/6 that can be used for CCP1/2/3 or PWM1/2/3.... Look at the PIC18FxxK40 and K42 offerings; both work with PBP3.1. I know there are more (including a bunch of PIC16F versions); you can search Microchip's site for these requirements (along with other requirements you need for your project).

  3. #3
    Join Date
    Feb 2018

    Default Re: 18F4553 HPWM x2 problem

    Thank you mpgmike, that got me back on the right track. I swapped for a 18F46K80 and I have things working the way I wanted them to. Appreciate the help.

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