PIC18LF4331T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4331T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D

Microchip Technology 

PIC18F2331/2431/4331/4431

FIGURE 18-4:

PWM TIME BASE BLOCK DIAGRAM

PTMR Register

PTMR Clock

Timer Reset

Up/Down

Comparator

Comparator

Zero Match

Period Match

PTMOD1

Timer

Direction

Control

PTDIR

Duty Cycle Load

PTPER

Period Load

FOSC/4

PTPER Buffer

Update Disable (UDIS)

Prescaler

1:1, 1:4, 1:16, 1:64

Zero Match

Zero Match

Period Match

PTMOD1

PTMOD0

Postscaler

1:1-1:16

Period Match

Clock

Control

Interrupt

Control

PTMOD1

PTMOD0

PTMR Clock

PTEN

PTIF

The PWM time base can be configured for four different

modes of operation:

• Free-Running mode

• Single-Shot mode

• Continuous Up/Down Count mode

• Continuous Up/Down Count mode with interrupts

for double updates

These four modes are selected by the PTMOD<1:0>

bits in the PTCON0 register. The Free-Running mode

produces edge-aligned PWM generation. The

Continuous Up/Down Count modes produce

center-aligned PWM generation. The Single-Shot

mode allows the PWM module to support pulse control

of certain Electronically Commutated Motors (ECMs)

and produces edge-aligned operation.

 2010 Microchip Technology Inc.

DS39616D-page 177

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