DSPIC30F6010A MICROCHIP [Microchip Technology], DSPIC30F6010A Datasheet - Page 91

• Manufacturer Part Number: DSPIC30F6010A
• Description: High-Performance, 16-bit Digital Signal Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

14.0
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 mechanical position data.
FIGURE 14-1:
© 2011 Microchip Technology Inc.
Note:
UPDN
QEA
QEB
INDX
QUADRATURE ENCODER
INTERFACE (QEI) MODULE
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, register descriptions and
general device functionality, refer to the
“dsPIC30F Family Reference Manual”
(DS70046).
Synchronize
Sleep Input
Det
PCDOUT
QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM
UPDN_SRC
0
Programmable
Programmable
1
Programmable
0
1
Digital Filter
Digital Filter
Digital Filter
QEICON<11>
Existing Pin Logic
3
Up/Down
T
QEIM<2:0>
CY
Quadrature
Encoder
Interface Logic
TQCS
1
0
QEIM<2:0>
Mode Select
3
TQGATE
1
0
2
dsPIC30F6010A/6015
The operational features of the QEI include:
• Three input channels for two phase signals and
• 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
Figure 14-1
block diagram.
index pulse
16-bit Up/Down Counter
Max Count Register
D
CK
Comparator/
Zero Detect
(POSCNT)
(MAXCNT)
depicts the Quadrature Encoder Interface
TQCKPS<1:0>
Q
Q
1, 8, 64, 256
bits,
Prescaler
2
QEIM<2:0>
Reset
Equal
(QEICON<10:8>).
DS70150E-page 91
QEIIF
Event
Flag