PIC18F/LF1XK50
DS41350E-page 130
Preliminary
2010 Microchip Technology Inc.
FIGURE 14-12:
PWM AUTO-SHUTDOWN WITH FIRMWARE RESTART (PRSEN = 0)
Note 1: The
auto-shutdown
condition
is
a
level-based signal, not an edge-based
signal. As long as the level is present, the
auto-shutdown will persist.
2: Writing to the ECCPASE bit is disabled
while
an
auto-shutdown
condition
persists.
3: Once the auto-shutdown condition has
been removed and the PWM restarted
(either through firmware or auto-restart)
the PWM signal will always restart at the
beginning of the next PWM period.
4: Prior to an auto-shutdown event caused
by a comparator output or INT pin event,
a software shutdown can be triggered in
firmware by setting the CCPxASE bit to a
‘1’. The auto-restart feature tracks the
active status of a shutdown caused by a
comparator output or INT pin event only
so, if it is enabled at this time. It will imme-
diately clear this bit and restart the ECCP
module at the beginning of the next PWM
period.
Shutdown
PWM
ECCPASE bit
Activity
Event
Shutdown
Event Occurs
Shutdown
Event Clears
PWM
Resumes
Normal PWM
Start of
PWM Period
ECCPASE
Cleared by
Firmware
PWM Period
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