Datasheet

 2013-2014 Microchip Technology Inc. DS70000689D-page 257
dsPIC33EPXXXGM3XX/6XX/7XX
17.0 QUADRATURE ENCODER
INTERFACE (QEI) MODULE
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
Figure 17-1 illustrates the QEIx block diagram.
Note 1: This data sheet summarizes the features
of the dsPIC33EPXXXGM3XX/6XX/7XX
family of devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to the “dsPIC33/PIC24 Fam-
ily Reference Manual”, “Quadrature
Encoder Interface (QEI)” (DS70601)
which is available from the Microchip web
site (www.microchip.com).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.