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List of Figures

1 Optical Encoder Disk ........................................................................................................ 8

2 QEP Encoder Output Signal for Forward/Reverse Movement ......................................................... 9

3 Index Pulse Example ........................................................................................................ 9

4 Functional Block Diagram of the eQEP Peripheral .................................................................... 12

5 Functional Block Diagram of Decoder Unit ............................................................................. 14

6 Quadrature Decoder State Machine ..................................................................................... 15

7 Quadrature-clock and Direction Decoding .............................................................................. 16

8 Position Counter Reset by Index Pulse for 1000 Line Encoder (QPOSMAX = 3999 or 0xF9F) ................. 18

9 Position Counter Underflow/Overflow (QPOSMAX = 4) .............................................................. 19

10 Software Index Marker for 1000-line Encoder (QEPCTL[IEL] = 1) .................................................. 21

11 Strobe Event Latch (QEPCTL[SEL] = 1) ................................................................................ 21

12 eQEP Position-compare Unit ............................................................................................. 22

13 eQEP Position-compare Event Generation Points ..................................................................... 23

14 eQEP Position-compare Sync Output Pulse Stretcher ................................................................ 23

15 eQEP Edge Capture Unit ................................................................................................. 25

16 Unit Position Event for Low Speed Measurement (QCAPCTL[UPPS] = 0010) .................................... 25

17 eQEP Edge Capture Unit - Timing Details .............................................................................. 26

18 eQEP Watchdog Timer .................................................................................................... 27

19 eQEP Unit Time Base ..................................................................................................... 28

20 EQEP Interrupt Generation ............................................................................................... 28

21 QEP Decoder Control (QDECCTL) Register ........................................................................... 29

22 eQEP Control (QEPCTL) Register ....................................................................................... 30

23 eQEP Position-compare Control (QPOSCTL) Register ............................................................... 31

24 eQEP Capture Control (QCAPCTL) Register .......................................................................... 32

25 eQEP Position Counter (QPOSCNT) Register ......................................................................... 33

26 eQEP Position Counter Initialization (QPOSINIT) Register........................................................... 33

27 eQEP Maximum Position Count Register (QPOSMAX) Register .................................................... 33

28 eQEP Position-compare (QPOSCMP) Register........................................................................ 33

29 eQEP Index Position Latch (QPOSILAT) Register .................................................................... 34

30 eQEP Strobe Position Latch (QPOSSLAT) Register .................................................................. 34

31 eQEP Position Counter Latch (QPOSLAT) Register .................................................................. 34

32 eQEP Unit Timer (QUTMR) Register .................................................................................... 35

33 eQEP Register Unit Period (QUPRD) Register ........................................................................ 35

34 eQEP Watchdog Timer (QWDTMR) Register .......................................................................... 35

35 eQEP Watchdog Period (QWDPRD) Register ......................................................................... 35

36 eQEP Interrupt Enable (QEINT) Register ............................................................................... 36

37 eQEP Interrupt Flag (QFLG) Register ................................................................................... 37

38 eQEP Interrupt Clear (QCLR) Register.................................................................................. 38

39 eQEP Interrupt Force (QFRC) Register ................................................................................. 39

40 eQEP Status (QEPSTS) Register ........................................................................................ 40

41 eQEP Capture Timer (QCTMR) Register ............................................................................... 41

42 eQEP Capture Period (QCPRD) Register .............................................................................. 41

43 eQEP Capture Timer Latch (QCTMRLAT) Register ................................................................... 41

44 eQEP Capture Period Latch (QCPRDLAT) Register .................................................................. 42

List of Figures4 SPRUG05A – August 2008 – Revised December 2008

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