PIC18F-LF1XK50 Datasheet, PDF (136/420 Pages) Microchip Technology – 20-Pin USB Flash Microcontrollers

PIC18F/LF1XK50
14.4.7.1 Steering Synchronization
The STRSYNC bit of the PSTRCON register gives the
user two selections of when the steering event will
happen. When the STRSYNC bit is ‘0’, the steering
event will happen at the end of the instruction that
writes to the PSTRCON register. In this case, the
output signal at the P1<D:A> pins may be an
incomplete PWM waveform. This operation is useful
when the user firmware needs to immediately remove
a PWM signal from the pin.
When the STRSYNC bit is ‘1’, the effective steering
update will happen at the beginning of the next PWM
period. In this case, steering on/off the PWM output will
always produce a complete PWM waveform.
Figures 14-17 and 14-18 illustrate the timing diagrams
of the PWM steering depending on the STRSYNC
setting.
FIGURE 14-17:
PWM
EXAMPLE OF STEERING EVENT AT END OF INSTRUCTION (STRSYNC = 0)
PWM Period
STRn
P1<D:A>
PORT Data
P1n = PWM
PORT Data
FIGURE 14-18:
EXAMPLE OF STEERING EVENT AT BEGINNING OF INSTRUCTION
(STRSYNC = 1)
PWM
STRn
P1<D:A>
PORT Data
P1n = PWM
PORT Data
DS41350E-page 136
Preliminary
 2010 Microchip Technology Inc.