PIC18F258-I/SP 查看數據表（PDF） - Microchip Technology

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PIC18F258-I/SP

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

FIGURE 16-7:

PWM DIRECTION CHANGE

SIGNAL

Period(1)

DC

P1A (Active-High)

P1B (Active-High)

P1C (Active-High)

P1D (Active-High)

Period

(2)

Note 1: The direction bit in the ECCP1 Control Register (ECCP1CON.EPWM1M1) is written any time during the PWM

cycle.

2: The P1A and P1C signals switch at intervals of TOSC, 4 TOSC or 16 TOSC, depending on the Timer2 prescaler

value earlier when changing direction. The modulated P1B and P1D signals are inactive at this time.

FIGURE 16-8:

PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE

Forward Period

Reverse Period

P1A(1)

P1B(1)

P1C(1)

P1D(1)

External Switch C(1)

External Switch D(1)

Potential

Shoot-Through

Current(1)

(PWM)

Note 1: All signals are shown as active-high.

2: ton is the turn-on delay of power switch and driver.

3: toff is the turn-off delay of power switch and driver.

(PWM)

ton(2)

toff(3)

t = toff – ton(2,3)

t1

© 2006 Microchip Technology Inc.

DS41159E-page 139

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