PIC18F4520ESLASHMLQTP datasheet(157/390 Pages) MICROCHIP

Part #	PIC18F4520E/MLQTP

Description	28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PDF	390 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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157 / 390 page

 2004 Microchip Technology Inc.

Preliminary

DS39631A-page 155

PIC18F2420/2520/4420/4520

FIGURE 16-8:

PWM DIRECTION CHANGE

FIGURE 16-9:

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.

2: When changing directions, the P1A and P1C signals switch before the end of the current PWM cycle at intervals

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(1)

tON

(2)

tOFF

(3)

t = tOFF – tON

(2,3)

P1B(1)

P1C(1)

P1D(1)

External Switch D(1)

Potential

Shoot-Through

Current(1)

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(1)

PIC18F4520E/MLQTP Datasheet(PDF) 157 Page - Microchip Technology

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