PIC18F2220 Datasheet, PDF (150/388 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2220/2320/4220/4320
FIGURE 16-8:
SIGNAL
PWM DIRECTION CHANGE
Period⁽¹⁾
Period
P1A (Active High)
P1B (Active High)
P1C (Active High)
P1D (Active High)
DC
DC
(Note 2)
Note 1: 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.
FIGURE 16-9:
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE⁽¹⁾
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⁽²⁾
t_off⁽³⁾
t = t_off – t_on^(2,3)
DS39599C-page 148
 2003 Microchip Technology Inc.