PIC16F689T-I/SO 查看數據表（PDF） - Microchip Technology

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PIC16F689T-I/SO

20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F631/677/685/687/689/690

11.4.7.1 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 11-20 and 11-21 illustrate the timing diagrams

of the PWM steering depending on the STRSYNC

setting.

FIGURE 11-20:

PWM

STRn

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

PWM Period

P1<D:A>

PORT Data

P1n = PWM

PORT Data

FIGURE 11-21:

EXAMPLE OF STEERING EVENT AT BEGINNING OF INSTRUCTION

(STRSYNC = 1)

PWM

STRn

P1<D:A>

PORT Data

P1n = PWM

PORT Data

DS41262E-page 148

© 2008 Microchip Technology Inc.

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