18F8680 datasheet(185/496 Pages) MICROCHIP

Part #	18F8680

Description	64/68/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with ECAN Module

PDF	496 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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185 / 496 page

 2004 Microchip Technology Inc.

DS30491C-page 183

PIC18F6585/8585/6680/8680

FIGURE 16-9:

PWM DIRECTION CHANGE

FIGURE 16-10:

PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE

Period(1)

SIGNAL

Note

The direction bit in the CCP1 Control register (CCP1CON<7>) is written any time during the PWM cycle.

When changing directions, the P1A and P1C signals switch before the end of the current PWM cycle at inter-

vals of 4 TOSC, 16 TOSC or 64 TOSC, depending on the Timer2 prescaler value. The modulated P1B and P1D

signals are inactive at this time.

Period

(Note 2)

P1A (Active-High)

P1B (Active-High)

P1C (Active-High)

P1D (Active-High)

Forward Period

Reverse Period

P1A

tON

tOFF

t = tOFF – tON

P1B

P1C

P1D

External Switch D

Potential

Shoot-Through

Current

Note

1: All signals are shown as active-high.

2: tON is the turn on delay of power switch QC and its driver.

3: tOFF is the turn off delay of power switch QD and its driver.

External Switch C

18F8680 Datasheet(PDF) 185 Page - Microchip Technology