PIC18F23K20-ESLASHML datasheet(189/456 Pages) MICROCHIP

Part #	PIC18F23K20-E/ML

Description	28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

PDF	456 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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189 / 456 page

 2010 Microchip Technology Inc.

DS41303G-page 189

PIC18F2XK20/4XK20

16.4.7.1

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 16-15 and 16-16 illustrate the timing diagrams

of the PWM steering depending on the STRSYNC

setting.

FIGURE 16-15:

EXAMPLE OF STEERING EVENT AT END OF INSTRUCTION (STRSYNC = 0)

FIGURE 16-16:

EXAMPLE OF STEERING EVENT AT BEGINNING OF INSTRUCTION

(STRSYNC = 1)

PWM

P1n = PWM

STRn

P1<D:A>

PORT Data

PWM Period

PORT Data

PWM

PORT Data

P1n = PWM

STRn

P1<D:A>

PORT Data

PIC18F23K20-E/ML Datasheet(PDF) 189 Page - Microchip Technology