DSPIC33FJ12MC02ESS datasheet(167/284 Pages) MICROCHIP

167 / 284 page

Preliminary

DS70265B-page 165

dsPIC33FJ12MC201/202

15.0 QUADRATURE ENCODER

INTERFACE (QEI) MODULE

This section 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 (QEICON<10:8>).

Figure 15-1 depicts the Quadrature Encoder Interface

block diagram.

FIGURE 15-1:

QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of the dsPIC33FJ12MC201/202 devices.

It is not intended to be a comprehensive

reference source. To complement the

information in this data sheet, refer to the

“dsPIC33F Family Reference Manual”.

Please see the Microchip web site

(www.microchip.com)

for

the

latest

dsPIC33F Family Reference Manual

chapters.

16-bit Up/Down Counter

Comparator/

Max Count Register

QEA

INDX

Up/Down

Existing Pin Logic

UPDN

QEB

QEIM<2:0>

Mode Select

(POSCNT)

(MAXCNT)

PCDOUT

QEIIF

Event

Flag

Reset

Equal

TCY

TQCS

TQCKPS<1:0>

TQGATE

QEIM<2:0>

Sleep Input

UPDN_SRC

QEICON<11>

Zero Detect

Synchronize

Det

1, 8, 64, 256

Prescaler

Quadrature

Encoder

Interface Logic

Programmable

Digital Filter

Programmable

Digital Filter

Programmable

Digital Filter

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