PIC18LF4331 datasheet(176/392 Pages) MICROCHIP

176 / 392 page

PIC18F2331/2431/4331/4431

DS39616D-page 176

 2010 Microchip Technology Inc.

18.1

Control Registers

The operation of the PWM module is controlled by a

total of 22 registers. Eight of these are used to

configure the features of the module:

• PWM Timer Control Register 0 (PTCON0)

• PWM Timer Control Register 1 (PTCON1)

• PWM Control Register 0 (PWMCON0)

• PWM Control Register 1 (PWMCON1)

• Dead-Time Control Register (DTCON)

• Output Override Control Register (OVDCOND)

• Output State Register (OVDCONS)

• Fault Configuration Register (FLTCONFIG)

There are also 14 registers that are configured as

seven register pairs of 16 bits. These are used for the

configuration values of specific features. They are:

• PWM Time Base Registers (PTMRH and PTMRL)

• PWM Time Base Period Registers (PTPERH and

PTPERL)

• PWM Special Event Trigger Compare Registers

(SEVTCMPH and SEVTCMPL)

• PWM Duty Cycle #0 Registers

(PDC0H and PDC0L)

• PWM Duty Cycle #1 Registers

(PDC1H and PDC1L)

• PWM Duty Cycle #2 Registers

(PDC2H and PDC2L)

• PWM Duty Cycle #3 Registers

(PDC3H and PDC3L)

All of these register pairs are double-buffered.

18.2

Module Functionality

The PWM module supports several modes of operation

that are beneficial for specific power and motor control

applications. Each mode of operation is described in

subsequent sections.

The PWM module is composed of several functional

blocks. The operation of each is explained separately

in relation to the several modes of operation:

•PWM Time Base

• PWM Time Base Interrupts

•PWM Period

• PWM Duty Cycle

• Dead-Time Generators

• PWM Output Overrides

• PWM Fault Inputs

• PWM Special Event Trigger

18.3

PWM Time Base

The PWM time base is provided by a 12-bit timer with

prescaler and postscaler functions. A simplified block

diagram of the PWM time base is shown in Figure 18-4.

The PWM time base is configured through the

PTCON0 and PTCON1 registers. The time base is

enabled or disabled by respectively setting or clearing

the PTEN bit in the PTCON1 register.

Note:

The PTMR register pair (PTMRL:PTMRH)

is not cleared when the PTEN bit is

cleared in software.

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