PIC18F248-E/L MICROCHIP [Microchip Technology], PIC18F248-E/L Datasheet - Page 141

• Manufacturer Part Number: PIC18F248-E/L
• Description: 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 16-7:
FIGURE 16-8:
© 2006 Microchip Technology Inc.
Note 1: The direction bit in the ECCP1 Control Register (ECCP1CON.EPWM1M1) is written any time during the PWM
External Switch C
External Switch D
Note 1: All signals are shown as active-high.
P1A (Active-High)
P1B (Active-High)
P1C (Active-High)
P1D (Active-High)
2: The P1A and P1C signals switch at intervals of T
Shoot-Through
SIGNAL
cycle.
value earlier when changing direction. The modulated P1B and P1D signals are inactive at this time.
2: t
3: t
Current
Potential
on
off
P1C
P1D
P1A
P1B
is the turn-off delay of power switch and driver.
is the turn-on delay of power switch and driver.
PWM DIRECTION CHANGE
PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(PWM)
DC
Forward Period
Period
(1)
OSC
, 4 T
OSC
or 16 T
t1
OSC
(PWM)
(2)
, depending on the Timer2 prescaler
t
on
(2)
t
t = t
off
Reverse Period
(3)
Period
off
– t
PIC18FXX8
on
(2,3)
DS41159E-page 139