PIC18F66K22 - Multiple PWMs

MotoDan · Joined: 30 Dec 2011 Posts: 55

Hello All,

I'm considering using a PIC18F66K22 for a new project that will require 8 PWM outputs whose duty cycle can be controlled independently. All PWMs will be operating at the same frequency. According to the datasheet, there are 7 CCP and 3 ECCP PWM outputs. The datasheet also lists the timer choices for each output. What I'm not 100% sure of is whether or not the duty cycle of each output can be unique. I don't have a development board for this family of MCUs, but do have the latest CCS compiler. My sample code compiles fine with 8 PWMs. Has anyone used this many PWMs on this family of devices?

Thanks in advance and Happy New Year!
MotoDan

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

They all have separate Period registers (CCPRx) so you should be able
to have a different duty cycle for each PWM channel.

You may not be able to have a different frequency for each PWM channel.
The Timer selection registers allow many different assignments of Timer
resources to the PWM modules. But I didn't go through the 18F66K22
data sheet in detail, to see if you can have a unique Timer for each PWM channel.

MotoDan · Joined: 30 Dec 2011 Posts: 55

Thanks PCM for the reply. I plan on running all of the PWMs at the same frequency so it should work out OK.