DSPIC30F0010AT-20ESLASHPF datasheet(89/232 Pages) MICROCHIP

89 / 232 page

DS70150D-page 89

dsPIC30F6010A/6015

14.0 QUADRATURE ENCODER

INTERFACE (QEI) MODULE

ThissectiondescribestheQuadratureEncoderInterface

(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>

(QEICON<10:8>).

Figure 14-1 depicts the Quadrature Encoder Interface

block diagram.

FIGURE 14-1:

QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM

Note:

This data sheet summarizes features of

this group of dsPIC30F devices and is not

intended to be a complete reference

source. For more information on the CPU,

peripherals, register descriptions and

general device functionality, refer to the

“dsPIC30F Family Reference Manual”

(DS70046).

16-bit Up/Down Counter

Comparator/

Max Count Register

Quadrature

Programmable

Digital Filter

QEA

Programmable

Digital Filter

INDX

Up/Down

Existing Pin Logic

UPDN

Encoder

Programmable

Digital Filter

QEB

Interface Logic

QEIM<2:0>

Mode Select

(POSCNT)

(MAXCNT)

PCDOUT

QEIIF

Event

Flag

Reset

Equal

TCY

TQCS

TQCKPS<1:0>

1, 8, 64, 256

Prescaler

TQGATE

QEIM<2:0>

Synchronize

Det

Sleep Input

UPDN_SRC

QEICON<11>

Zero Detect

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