PIC18F258 Datasheet, PDF (139/384 Pages) Microchip Technology – High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN

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