Datasheet
0
1
1
0
QA
QB
1
1
0
0
QDECCTL:QBP
Quadrature
decoder
00
01
10
11
iCLK
xCLK
xCLK
xCLK
01
11
10
00
iDIR
xDIR
1
0
QDECCTL:QSRC
2
QFLG:PHE
PHE
QDECCTL:QAP
x1
x2
x1, x2
QDECCTL:XCR
0
1
1
0
QDECCTL:QIP
QDECCTL:IGATE
QCLK
QDIR
QI
1
0
QDECCTL:QSP
0
1
QDECCTL:SPSEL
QDECCTL:SPSEL
1
0
QDECCTL:SOEN
QS
PCSOUT
EQEPxIOE
EQEPxSOE
EQEPxIOUT
EQEPxSOUT
EQEPxSIN
EQEPxIIN
EQEPxBIN
EQEPxAIN
QDECCTL:SWAP
QEPSTS:QDF
EQEPA
EQEPB
Basic Operation
www.ti.com
33.2.2.2 Quadrature Decoder Unit (QDU)
Figure 33-5 shows a functional block diagram of the QDU.
Figure 33-5. Functional Block Diagram of Decoder Unit
33.2.2.2.1 Position Counter Input Modes
Clock and direction input to position counter is selected using QDECCTL[QSRC] bits, based on interface
input requirement as follows:
• Quadrature-count mode
• Direction-count mode
• UP-count mode
• DOWN-count mode
1680
Enhanced QEP (eQEP) Module SPNU562–May 2014
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated