Datasheet

PIC16(L)F1782/3

DS41579D-page 222 Preliminary  2011-2012 Microchip Technology Inc.

24.3.10 VARIABLE FREQUENCY – FIXED

DUTY CYCLE PWM

This mode of operation is quite different from all of the

other modes. It uses only the period event for

waveform generation. At each period event, the PWM

output is toggled.

The rising edge and falling edge events are unused in

this mode.

24.3.10.1 Mode Features

• No dead-band control available

• No steering control available

• Fractional Frequency Adjust

- Fine period adjustments are made with the

PSMC Fractional Frequency Adjust

(PSMCxFFA) register (Register 24-27)

• PWM is output on the following pin only:

- PSMCxA

24.3.10.2 Waveform Generation

Period Event

• Output of PSMCxA is toggled

• FFA counter is incremented by the 4-bit value in

PSMCxF FA

FIGURE 24-13: VARIABLE FREQUENCY – FIXED DUTY CYCLE PWM WAVEFORM

1 2 3 4 5 6 7 8 9 10

Unused in this mode

PWM Period Number

period_event

Rising Edge Event

Falling Edge Event

PSMCxA