READER-TO-READER TECHFORUM
Microchip Technology has labeled the PWM section of
the PIC16F690 MCU, "Enhanced Capture/Compare/PWM
Module," but I'll refer only to its PWM capabilities that let
you set the pulse period (or frequency) and the pulse width.
You can read the PWM Operations section below and then
the PWM Setup & Use section, or simply jump ahead to the
latter section if you just want to use the PWM and don't
care how it works.
PWM Setup & Use
In the PIC16F690 MCU, you direct the PWM signal to
the P1A (pin 5), the P1B pin (pin 6), the P1C pin (pin 7), or
the P1D pin (pin 14). The information that follows will use
the P1A output which, according to the MCU's datasheet,
has the combined functions RC5/CCP1/P1A. So, this pin
shares functions between the PWM output and port C, bit
RC5. I'll use the pin solely as the PWM output.
To simplify use of the PWM output, I recommend you
start with the PICDEM Lab 1 experiment that sets on on-off
pattern on eight LEDs connected to the eight port C pins
on the 16F690 MCUs. When you can successfully run this
program, add the PWM program steps as explained next.
For the Lab 1 information, refer to the Microchip
document, "PICDEM Lab Development Board User's
Guide," DS41369B, available for download at: http://ww1.
microchip.com/downloads/en/DeviceDoc/41369B.pdf.”
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