PIC18FXX8 Datasheet, PDF (141/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

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⁽¹⁾
P1B⁽¹⁾
P1C⁽¹⁾
P1D⁽¹⁾
External Switch C⁽¹⁾
External Switch D⁽¹⁾
Potential
Shoot-Through
Current⁽¹⁾
(PWM)
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.
(PWM)
t_on⁽²⁾
t_off⁽³⁾
t = t_off – t_on^(2,3)
t1
 2004 Microchip Technology Inc.
DS41159D-page 139