PIC16F685-ESLASHSS datasheet(144/294 Pages) MICROCHIP

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PIC16F631/677/685/687/689/690

DS41262D-page 142

FIGURE 11-14:

PWM AUTO-SHUTDOWN WITH FIRMWARE RESTART (PRSEN = 0)

11.4.5

AUTO-RESTART MODE

The Enhanced PWM can be configured to automati-

cally restart the PWM signal once the auto-shutdown

condition has been removed. Auto-restart is enabled by

setting the PRSEN bit in the PWM1CON register.

If auto-restart is enabled, the ECCPASE bit will remain

set as long as the auto-shutdown condition is active.

When the auto-shutdown condition is removed, the

ECCPASE bit will be cleared via hardware and normal

operation will resume.

FIGURE 11-15:

PWM AUTO-SHUTDOWN WITH AUTO-RESTART ENABLED (PRSEN = 1)

Note 1: The

auto-shutdown

condition

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

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.

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

Shutdown

PWM

ECCPASE bit

Activity

Event

Shutdown

Event Occurs

Shutdown

Event Clears

PWM

Resumes

Normal PWM

Start of

PWM Period

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