Microchip Technology ARD00385 Data Sheet

 2009-2011 Microchip Technology Inc.

DS39957D-page 257

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.

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

CCPR1L

CCPR1H (Slave)

Comparator

TMR2

Comparator

PR2

R

Q

S

Duty Cycle Registers

DC1B<1:0>

Clear Timer2,
Toggle PWM Pin and 
Latch Duty Cycle

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.

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

ECCP1DEL

ECCPx/PxA

PxB

PxC

PxD