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eQEP Registers
1993
SPNU563A–March 2018
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Enhanced Quadrature Encoder Pulse (eQEP) Module
34.3.21 eQEP Status Register (QEPSTS)
Figure 34-41. eQEP Status Register (QEPSTS) [offset = 3Ah]
15 8
Reserved
R-0
7 6 5 4 3 2 1 0
UPEVNT FIDF QDF QDLF COEF CDEF FIMF PCEF
R-1 R-0 R-0 R-0 R/W-1 R/W-1 R/W-1 R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 34-24. eQEP Status Register (QEPSTS) Field Descriptions
Bit Field Value Description
15-8 Reserved 0 Always read as 0.
7 UPEVNT Unit position event flag.
0 No unit position event is detected.
1 Unit position event is detected. Write 1 to clear.
6 FIDF Direction on the first index marker. Status of the direction is latched on the first index event marker.
0 Counter-clockwise rotation (or reverse movement) on the first index event.
1 Clockwise rotation (or forward movement) on the first index event.
5 QDF Quadrature direction flag.
0 Counter-clockwise rotation (or reverse movement).
1 Clockwise rotation (or forward movement).
4 QDLF eQEP direction latch flag. Status of direction is latched on every index event marker.
0 Counter-clockwise rotation (or reverse movement) on index event marker.
1 Clockwise rotation (or forward movement) on index event marker.
3 COEF Capture overflow error flag.
0 Sticky bit, cleared by writing 1.
1 Overflow occurred in eQEP Capture timer (QCTMR).
2 CDEF Capture direction error flag.
0 Sticky bit, cleared by writing 1.
1 Direction change occurred between the capture position event.
1 FIMF First index marker flag.
0 Sticky bit, cleared by writing 1.
1 Set by first occurrence of index pulse.
0 PCEF Position counter error flag. This bit is not sticky and it is updated for every index event.
0 No error occurred during the last index transition.
1 Position counter error.
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