Datasheet

 2011-2012 Microchip Technology Inc. Preliminary DS41579D-page 221
PIC16(L)F1782/3
24.3.9 ECCP COMPATIBLE FULL-BRIDGE
PWM
This mode of operation is designed to match the
Full-Bridge mode from the ECCP module. It is called
ECCP compatible as the term “full-bridge” alone has
different connotations in regards to the output
waveforms.
Full-Bridge Compatible mode uses the same
waveform events as the single PWM mode to
generate the output waveforms.
There are both Forward and Reverse modes available
for this operation, again to match the ECCP implemen-
tation. Direction is selected with the mode control bits.
24.3.9.1 Mode Features
• Dead-band control available on direction switch
- Changing from forward to reverse uses the
falling edge dead-band counters.
- Changing from reverse to forward uses the
rising edge dead-band counters.
• No steering control available
• PWM is output on the following four pins only:
- PSMCxA
- PSMCxB
- PSMCxC
- PSMCxD
24.3.9.2 Waveform Generation - Forward
In this mode of operation, three of the four pins are
static. PSMCxA is the only output that changes based
on rising edge and falling edge events.
S
tatic Signal Assignment
• Outputs set to active state
- PSMCxD
• Outputs set to inactive state
- PSMCxB
- PSMCxC
Rising Edge Event
• PSMCxA is set active
Falling Edge Event
• PSMCxA is set inactive
24.3.9.3 Waveform Generation – Reverse
In this mode of operation, three of the four pins are
static. Only PSMCxB toggles based on rising edge
and falling edge events.
Static Signal Assignment
• Outputs set to active state
- PSMCxC
• Outputs set to inactive state
- PSMCxA
- PSMCxD
Rising Edge Event
• PSMCxB is set active
Falling Edge Event
• PSMCxB is set inactive
FIGURE 24-12: ECCP COMPATIBLE FULL-BRIDGE PWM WAVEFORM – PSMCXSTR0 = 0FH
1 2 3 4 5 6 7 8 9 10 11 12
Rising Edge Dead Band
Falling Edge Dead Band
Forward mode operation
PWM Period Number
Period Event
Falling Edge Event
Reverse mode operation
PSMCxA
PSMCxB
PSMCxC
PSMCxD