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| PIC18F1220_07 Datasheet, PDF (127/308 Pages) Microchip Technology – 18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-bit A/D and nanoWatt Technology | |||
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PIC18F1220/1320
FIGURE 15-10: PWM DIRECTION CHANGE (ACTIVE-HIGH)
SIGNAL
PWM Period(1)
PWM Period
P1A
P1B
P1C
P1D
DC
DC
One Timer2 Count(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 toggle one Timer2 count before the end of the current PWM cycle.
The modulated P1B and P1D signals are inactive at this time.
FIGURE 15-11:
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE (ACTIVE-HIGH)
Forward Period
t1
Reverse Period
P1A
P1B
P1C
P1D
DC
External Switch C
External Switch D
Potential
Shoot-Through
Current
Note 1: tON is the turn-on delay of power switch QC and its driver.
2: tOFF is the turn-off delay of power switch QD and its driver.
DC
tON
tOFF
t = tOFF â tON
© 2007 Microchip Technology Inc.
DS39605F-page 125
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