DSPIC30F6010 MICROCHIP [Microchip Technology], DSPIC30F6010 Datasheet - Page 81

• Manufacturer Part Number: DSPIC30F6010
• Description: High-Performance 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:
 2004 Microchip Technology Inc.
Note: 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).
UPDN
QEA
QEB
INDX
QUADRATURE ENCODER
INTERFACE (QEI) MODULE
Synchronize
Sleep Input
Det
PCDOUT
UPDN_SRC
QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM
Programmable
Programmable
0
1
Programmable
1
0
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
Preliminary
3
TQGATE
1
0
2
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 depicts the Quadrature Encoder Interface
block diagram.
index pulse
16-bit Up/Down Counter
Max Count Register
D
CK
Comparator/
Zero Detect
(POSCNT)
(MAXCNT)
TQCKPS<1:0>
Q
Q
1, 8, 64, 256
bits
Prescaler
2
dsPIC30F6010
QEIM<2:0>
Reset
Equal
(QEICON<10:8>).
DS70119D-page 79
QEIIF
Event
Flag