PIC18F2221 MICROCHIP [Microchip Technology], PIC18F2221 Datasheet - Page 157

• Manufacturer Part Number: PIC18F2221
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 16-8:
FIGURE 16-9:
© 2007 Microchip Technology Inc.
Note 1: The direction bit in the CCP1 Control register (CCP1CON<7>) is written any time during the PWM cycle.
P1A (Active-High)
P1B (Active-High)
P1C (Active-High)
P1D (Active-High)
Note 1: All signals are shown as active-high.
External Switch C
External Switch D
2: When changing directions, the P1A and P1C signals switch before the end of the current PWM cycle at intervals
SIGNAL
of 4 T
are inactive at this time.
Shoot-Through
2: t
3: t
OSC
ON
OFF
Current
Potential
is the turn-on delay of power switch QC and its driver.
P1C
P1D
P1A
P1B
PWM DIRECTION CHANGE
, 16 T
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE
is the turn-off delay of power switch QD and its driver.
(1)
(1)
(1)
(1)
(1)
(1)
(1)
OSC
or 64 T
DC
OSC
, depending on the Timer2 prescaler value. The modulated P1B and P1D signals
Forward Period
Period
DC
Preliminary
(1)
PIC18F4321 FAMILY
t1
DC
(Note 2)
t
ON
Reverse Period
t
t = t
(2)
OFF
(3)
OFF
Period
DC
– t
ON
(2,3)
DS39689E-page 155