The manual with version 2.50 is vague on how many HPWM channels the new PBP or PBPL will support but it is at least 5 with the appropriate PIC.
The manual is also vague on whether you can have different frequencies on different HPWM channels. This will relate to how the various timers are associated with the HPWM modules - read the data sheet for your particular PIC. The maximum frequency with PBP is 32767 Hz but with PBPL looks like it will be higher - vague manual again.
I routinely use two channels HPWM in the 16F877A and both using the same frequency is not a problem in my case.
HTH
Brian
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