DSPIC33FJ32MC304-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

DSPIC33FJ32MC304-I/SP

16-bit Digital Signal Controllers (up to 128 KB Flash and 16K SRAM) with Motor Control PWM and Advanced Analog

Microchip Technology 

dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04

17.0 QUADRATURE ENCODER

INTERFACE (QEI) MODULE

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32MC302/304,

dsPIC33FJ64MCX02/X04

and

dsPIC33FJ128MCX02/X04 family of

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 15. “Quadrature

Encoder Interface (QEI)” (DS70208) of

the

“dsPIC33F/PIC24H

Family

Reference Manual”, which is available

from the Microchip web site

(www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

This chapter describes the Quadrature Encoder

Interface (QEI) module and associated operational

modes. The QEI module provides the interface to incre-

mental encoders for obtaining mechanical position data.

The operational features of the QEI include:

• Three input channels for two phase signals and

index pulse

• 16-bit up/down position counter

• Count direction status

• Position Measurement (x2 and x4) mode

• Programmable digital noise filters on inputs

• Alternate 16-bit Timer/Counter mode

• Quadrature Encoder Interface interrupts

These operating modes are determined by setting the

appropriate bits, QEIM<2:0> bits (QEIxCON<10:8>).

Figure 17-1 depicts the Quadrature Encoder Interface

block diagram.

Note:

An ‘x’ used in the names of pins, control/

status bits and registers denotes a

particular Quadrature Encoder Interface

(QEI) module number (x = 1 or 2).

FIGURE 17-1:

QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM (x = 1 OR 2)

Sleep Input

Synchronize

Det

TQCS

TCY

0

1

TQCKPS<1:0>

2

Prescaler

1, 8, 64, 256

QEIM<2:0>

1

0

TQGATE

DQ

CK Q

QExIF

Event

Flag

QEAx

QEBx

Programmable

2

Digital Filter

UPDN_SRC

Quadrature

Encoder

Interface Logic

QEIxCON<11>

0

1

3

QEIM<2:0>

Mode Select

Programmable

Digital Filter

16-bit Up/Down Counter

(POSxCNT)

Reset

Comparator/

Zero Detect

Equal

Max Count Register

(MAXxCNT)

INDXx

UPDNx

Programmable

Digital Filter

PCDOUT

3

Existing Pin Logic

Up/Down

1

© 2007-2012 Microchip Technology Inc.

DS70291G-page 227

Share Link: