Microchip Technology MA330028 Data Sheet
2011-2013 Microchip Technology Inc.
DS70000657H-page 249
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
17.0
QUADRATURE ENCODER
INTERFACE (QEI) MODULE
(dsPIC33EPXXXMC20X/50X
and PIC24EPXXXMC20X
DEVICES ONLY)
INTERFACE (QEI) MODULE
(dsPIC33EPXXXMC20X/50X
and PIC24EPXXXMC20X
DEVICES ONLY)
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
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
• 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.
Note 1:
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)”
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
Family Reference Manual
”, which is avail-
www.microchip.com
).
2:
Some registers and associated bits
described in this section may not be
available on all devices. Refer to
described in this section may not be
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
and bit information.