PIC18F6585 Datasheet, PDF (185/496 Pages) Microchip Technology – 64/68/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with ECAN Module

PIC18F6585/8585/6680/8680
FIGURE 16-9:
PWM DIRECTION CHANGE
SIGNAL
Period⁽¹⁾
Period
P1A (Active-High)
P1B (Active-High)
DC
P1C (Active-High)
P1D (Active-High)
DC
(Note 2)
Note 1:
2:
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.
FIGURE 16-10:
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE
Forward Period
t1
Reverse Period
P1A
P1B
P1C
P1D
DC
External Switch C
External Switch D
Potential
Shoot-Through
Current
Note 1: All signals are shown as active-high.
2: t_ON is the turn on delay of power switch QC and its driver.
3: t_OFF is the turn off delay of power switch QD and its driver.
DC
t_ON
t_OFF
t = t_OFF – t_ON
 2004 Microchip Technology Inc.
DS30491C-page 183