PIC18F1XK22 Datasheet, PDF (132/388 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F1XK22/LF1XK22
13.4.7.1 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 13-17 and 13-18 illustrate the timing diagrams
of the PWM steering depending on the STRSYNC
setting.
FIGURE 13-17:
PWM
EXAMPLE OF STEERING EVENT AT END OF INSTRUCTION (STRSYNC = 0)
PWM Period
STRn
P1<D:A>
PORT Data
P1n = PWM
PORT Data
FIGURE 13-18:
EXAMPLE OF STEERING EVENT AT BEGINNING OF INSTRUCTION
(STRSYNC = 1)
PWM
STRn
P1<D:A>
PORT Data
P1n = PWM
PORT Data
DS41365D-page 132
Preliminary
 2010 Microchip Technology Inc.