DSPIC30F3011 Microchip Technology Inc., DSPIC30F3011 Datasheet - Page 87

• Manufacturer Part Number: DSPIC30F3011
• Description: Dspic30f3010/3011 Enhanced Flash 16-bit Digital Signal Controller
• Manufacturer: Microchip Technology Inc.

14.0
This section describes the Quadrature Encoder
Interface (QEI) module and associated operational
modes. The QEI module provides the interface to
incremental encoders for obtaining mechanical position
data.
FIGURE 14-1:
© 2007 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).
QEB
INDX
QEA
Note 1:
QUADRATURE ENCODER
INTERFACE (QEI) MODULE
Synchronize
Sleep Input
In dsPIC30F3010/3011, the UPDN pin is not available. Up/Down logic bit can still be polled by software.
Det
UPDN_SRC
QUADRATURE ENCODER INTERFACE BLOCK DIAGRAM
Programmable
Programmable
Programmable
0
1
Digital Filter
Digital Filter
Digital Filter
QEICON<11>
3
T
QEIM<2:0>
CY
Quadrature
Encoder
Interface Logic
TQCS
1
0
Up/Down
QEIM<2:0>
Mode Select
Confidential
3
(1)
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
dsPIC30F3010/3011
16-bit Up/Down Counter
Max Count Register
D
CK
Comparator/
Zero Detect
(MAXCNT)
(POSCNT)
TQCKPS<1:0>
Q
Q
1, 8, 64, 256
bits
Prescaler
2
QEIM<2:0>
Reset
Equal
(QEICON<10:8>).
DS70141D-page 85
QEIIF
Event
Flag