DSPIC33FJMC202ESS datasheet(174/330 Pages) MICROCHIP

174 / 330 page

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

DS70283K-page 174

16.1

Ouadrature Encoder Interface

Resources

Many useful resources are provided on the main prod-

uct page of the Microchip web site for the devices listed

in this data sheet. This product page, which can be

accessed using this link, contains the latest updates

and additional information.

16.1.1

KEY RESOURCES

• Section 15. “Quadrature Encoder Interface

(QEI)” (DS70208)

• Code Samples

• Application Notes

• Software Libraries

• Webinars

• All related dsPIC33F/PIC24H Family Reference

Manuals Sections

• Development Tools

16.2

Control and Status Registers

The QEI module has four user-accessible registers,

accessible in either Byte or Word mode:

• Control/Status Register (QEICON) – Allows

control of the QEI operation and status flags

indicating the module state.

• Digital Filter Control Register (DFLTCON) –

Allows control of the digital input filter operation.

• Position Count Register (POSCNT) – Allows

reading and writing of the 16-bit position counter.

• Maximum Count Register (MAXCNT) – Holds a

value that is compared to the POSCNT counter in

some operations.

Note:

In the event you are not able to access

the product page using the link above,

enter

this

URL

your

browser:

http://www.microchip.com/wwwproducts/

Devices.aspx?dDocName=en530334

Note:

The

POSCNT

allows

byte

accesses. However, reading the register

in Byte mode can result in partially

updated values in subsequent reads.

Either use Word mode reads/writes, or

ensure that the counter is not counting

during Byte operations.

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