PIC18LF4331 datasheet(151/392 Pages) MICROCHIP

151 / 392 page

 2010 Microchip Technology Inc.

DS39616D-page 151

PIC18F2331/2431/4331/4431

17.0

MOTION FEEDBACK MODULE

The Motion Feedback Module (MFM) is a special

purpose peripheral designed for motion feedback

applications. Together with the Power Control PWM

(PCPWM) module (see Section 18.0 “Power Control

PWM Module”

), it provides a variety of control

solutions for a wide range of electric motors.

The module actually consists of two hardware

submodules:

• Input Capture (IC)

• Quadrature Encoder Interface (QEI)

Together with Timer5 (see Section 15.0 “Timer5

Module”

), these modules provide a number of

options for motion and control applications.

Many of the features for the IC and QEI submodules

are fully programmable, creating a flexible peripheral

structure that can accommodate a wide range of

in-system uses. An overview of the available features

is presented in Table 17-1. A simplified block diagram

of the entire Motion Feedback Module is shown in

Figure 17-1.

TABLE 17-1:

SUMMARY OF MOTION FEEDBACK MODULE FEATURES

Note:

Because the same input pins are common

to the IC and QEI submodules, only one of

these two submodules may be used at

any given time. If both modules are on, the

QEI submodule will take precedence.

Submodule

Mode(s)

Features

Timer

Function

IC (3x)

• Synchronous

• Input Capture

• Flexible Input Capture modes

• Available Prescaler

• Selectable Time Base Reset

• Special Event Trigger for ADC

Sampling/Conversion or Optional

TMR5 Reset Feature (CAP1 only)

• Wake-up from Sleep function

• Selectable Interrupt Frequency

• Optional Noise Filter

TMR5

• 3x Input Capture (edge

capture, pulse width, period

measurement, capture on

change)

• Special Event Triggers the

A/D Conversion on the CAP1

Input

QEI

• Detect Position

• Detect Direction of Rotation

• Large Bandwidth (FCY/16)

• Optional Noise Filter

16-Bit

Position

Counter

• Position Measurement

• Direction of Rotation Status

Velocity

Measurement

• 2x and 4x Update modes

• Velocity Event Postscaler

• Counter Overflow Flag for Low

Rotation Speed

• Utilizes Input Capture 1 Logic

(IC1)

• High and Low Velocity Support

TMR5

• Precise Velocity Measurement

• Direction of Rotation Status

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