DSPIC33FJ32GS608 datasheet(255/416 Pages) MICROCHIP

255 / 416 page

 2009 Microchip Technology Inc.

Preliminary

DS70591B-page 255

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

17.0 QUADRATURE ENCODER

INTERFACE (QEI) MODULE

This chapter describes the Quadrature Encoder Inter-

face (QEI) module and associated operational modes.

The QEI module provides the interface to incremental

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> in (QEIxCON<10:8>).

Figure 17-1 depicts the Quadrature Encoder Interface

block diagram.

FIGURE 17-1:

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

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610

families 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) in

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 avail-

able on all devices. Refer to Section 4.0

“Memory Organization” in this data

sheet for device-specific register and bit

information.

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).

16-bit Up/Down Counter

Comparator/

Max Count Register

QEAx(1)

INDXx(1)

Up/Down

Existing Pin Logic

UPDNx

QEBx(1)

QEIM<2:0>

Mode Select

(POSxCNT)

(MAXxCNT)

PCDOUT

QExIF

Event

Flag

Reset

Equal

TCY

TQCS

TQCKPS<1:0>

TQGATE

QEIM<2:0>

Sleep Input

UPDN_SRC

QEIxCON<11>

Zero Detect

Synchronize

Det

1, 8, 64, 256

Prescaler

Quadrature

Encoder

Interface Logic

Programmable

Digital Filter

Programmable

Digital Filter

Programmable

Digital Filter

Note 1: The QEI1 module can be connected to the QEA1/QEB1/INDX1

or AQEA1/AQEB1/AINDX1 pins, which are controlled by clearing

or setting the ALTQIO bit in the FPOR Configuration register. See

Section 24.0 “Special Features” for more information.

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