Microchip Technology DM183037 Data Sheet

 2012 Microchip Technology Inc.

DS30575A-page 323

The Enhanced PWM mode can generate a PWM signal
on up to four different output pins, with up to 10 bits of
resolution. It can do this through four different PWM
Output modes:
• Single PWM
• Half-Bridge PWM
• Full-Bridge PWM, Forward mode
• Full-Bridge PWM, Reverse mode
To select an Enhanced PWM mode, the PxM bits of the
CCPxCON register must be set appropriately.

The PWM outputs are multiplexed with I/O pins and are
designated: PxA, PxB, PxC and PxD. The polarity of the
PWM pins is configurable and is selected by setting the
CCPxM bits in the CCPxCON register appropriately.

 provides the pin assignments for each

Enhanced PWM mode.

 provides an example of a simplified block

diagram of the Enhanced PWM module.

To prevent the generation of an
incomplete waveform when the PWM is
first enabled, the ECCP module waits until
the start of a new PWM period before
generating a PWM signal.

CCPRxL

CCPRxH (Slave)

Comparator

TMR2

Comparator

PR2

R

Q

S

Duty Cycle Registers

DCxB<1:0>

Clear Timer2,

Toggle PWM Pin and 

Latch Duty Cycle

Note 1: The 8-bit TMR2 register is concatenated with the 2-bit internal Q clock, or 2 bits of the prescaler, to create the

10-bit time base.

2: The TRIS register value for each PWM output must be configured appropriately.
3: Any pin not used by an Enhanced PWM mode is available for alternate pin functions.

TRIS

ECCP1/Output Pi

n

TRIS

Output Pi

n

TRIS

Output Pi

n

TRIS

Output Pi

n

Output

Controller

PxM<1:0>

2

CCPxM<3:0>

4

ECCPxDEL

ECCPx/PxA

PxB

PxC

PxD