DSPIC30F3010 datasheet(91/228 Pages) MICROCHIP

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DS70141F-page 91

dsPIC30F3010/3011

14.0

QUADRATURE ENCODER

INTERFACE (QEI) MODULE

This section describes the Quadrature Encoder

Interface (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,

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(1)

Encoder

Programmable

Digital Filter

QEB

Interface Logic

QEIM<2:0>

Mode Select

(POSCNT)

(MAXCNT)

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

Note

In dsPIC30F3010/3011, the UPDN pin is not available. Up/Down logic bit can still be polled by software.

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