PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 139

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 16-7:
FIGURE 16-8:
 2002 Microchip Technology Inc.
Note 1: The direction bit in the ECCP1 Control Register (ECCP1CON.EPWM1M1) is written any time during the PWM
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
SIGNAL
2: The P1A and P1C signals switch at intervals of T
Potential
Shoot-Through
Current
2: t
3: t
cycle.
earlier when changing direction. The modulated P1B and P1D signals are inactive at this time.
on
off
is the Turn-on Delay of power switch and driver.
is the Turn-off Delay of power switch and driver.
P1C
P1D
P1A
P1B
PWM DIRECTION CHANGE
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE
(PWM)
DC
PERIOD
FORWARD PERIOD
Preliminary
(1)
OSC
, 4 T
OSC
or 16 T
t1
(2)
(PWM)
OSC
t
, depending on the Timer2 prescaler value
on
REVERSE PERIOD
t
t = t
off
PERIOD
off
– t
PIC18FXX8
on
DS41159B-page 137