Microchip Technology MA330031-2 Data Sheet

 2011-2013 Microchip Technology Inc.

DS70000657H-page 249

This chapter 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 module include:
• 32-Bit Position Counter
• 32-Bit Index Pulse Counter
• 32-Bit Interval Timer
• 16-Bit Velocity Counter
• 32-Bit Position Initialization/Capture/Compare 

High register

• 32-Bit Position Compare Low register
• x4 Quadrature Count mode
• External Up/Down Count mode
• External Gated Count mode
• External Gated Timer mode
• Internal Timer mode

 illustrates the QEI block diagram.

This data sheet summarizes the
features of the dsPIC33EPXXXGP50X,
dsPIC33EPXXXMC20X/50X and
PIC24EPXXXGP/MC20X families of
devices. It is not intended to be a
comprehensive reference source. To com-
plement the information in this data sheet,
refer to “Quadrature Encoder Interface
(QEI)”

 (DS70601) in the “dsPIC33/PIC24

”, which is avail-

able from the Microchip web site
(

www.microchip.com

).

Some registers and associated bits
described in this section may not be
available on all devices. Refer to

 in

this data sheet for device-specific register
and bit information.