PIC18F1220 MICROCHIP [Microchip Technology], PIC18F1220 Datasheet - Page 127

• Manufacturer Part Number: PIC18F1220
• Description: 18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 15-10:
FIGURE 15-11:
 2004 Microchip Technology Inc.
Note 1: The direction bit in the CCP1 Control register (CCP1CON<7>) is written any time during the PWM cycle.
Note 1: t
External Switch C
External Switch D
2: When changing directions, the P1A and P1C toggle one Timer2 count before the end of the current PWM cycle.
SIGNAL
Shoot-Through
The modulated P1B and P1D signals are inactive at this time.
2: t
Potential
P1A
P1B
P1C
P1D
Current
ON
OFF
P1C
P1D
P1A
P1B
PWM DIRECTION CHANGE (ACTIVE-HIGH)
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE (ACTIVE-HIGH)
is the turn-on delay of power switch QC and its driver.
is the turn-off delay of power switch QD and its driver.
DC
PWM Period
Forward Period
DC
(1)
t1
PIC18F1220/1320
DC
One Timer2 Count
t
ON
Reverse Period
PWM Period
t
t = t
OFF
OFF
DC
– t
ON
(2)
DS39605C-page 125