DSPIC30F2010 datasheet(75/202 Pages) MICROCHIP

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DS70118J-page 75

dsPIC30F2010

13.0

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 motor positioning data. Incre-

mental encoders are very useful in motor control

applications.

The Quadrature Encoder Interface (QEI) is a key fea-

ture requirement for several motor control applications,

such as Switched Reluctance (SR) and AC Induction

Motor (ACIM). The operational features of the QEI are,

but not limited to:

• 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 13-1 depicts the Quadrature Encoder Interface

block diagram.

FIGURE 13-1:

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

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

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