Functional Block Diagram Of Decoder Unit - Texas Instruments Concerto F28M35 Series Technical Reference Manual

Quadrature Decoder Unit (QDU)
9.3 Quadrature Decoder Unit (QDU)
Figure 9-5 shows a functional block diagram of the QDU.
PHE
00
QCLK 01
10
11
00
01
QDIR
10
11
2
QDECCTL:QSRC
QI
QS
PCSOUT
QDECCTL:SOEN
9.3.1 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
826
C28 Enhanced QEP (eQEP) Module
Figure 9-5. Functional Block Diagram of Decoder Unit
QFLG:PHE QEPSTS:QDF
iCLK
xCLK
xCLK
Quadrature
xCLK
decoder
iDIR
xDIR
1
0
x1
x2
x1, x2
QDECCTL:XCR
QDECCTL:IGATE
QDECCTL:SPSEL
QDECCTL:SPSEL
Copyright © 2012–2019, Texas Instruments Incorporated
QDECCTL:SWAP
QDECCTL:QAP
0
EQEPA
0
QA
1
1
0
EQEPB
0
QB
1
1
QDECCTL:QIP
0
0
1
1
0
1
0
1
0
1
SPRUH22I – April 2012 – Revised November 2019
www.ti.com
EQEPxAIN
EQEPxBIN
QDECCTL:QBP
EQEPxIIN
EQEPxSIN
QDECCTL:QSP
EQEPxIOUT
EQEPxSOUT
EQEPxIOE
EQEPxSOE
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