DSPIC33FJMC202ESS datasheet(173/330 Pages) MICROCHIP

173 / 330 page

DS70283K-page 173

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

16.0 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 (QEIxCON<10:8>).

Figure 16-1 depicts the Quadrature Encoder Interface

block diagram.

FIGURE 16-1:

QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32MC202/204 and

dsPIC33FJ16MC304 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 website (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.

16-bit Up/Down Counter

Comparator/

Max Count Register

QEAx

INDXx

Up/Down

Existing Pin Logic

UPDNx

QEBx

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

QEIxCON<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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