www.ti.com
Enhanced Quadrature Encoder Pulse (eQEP) Module
15.4.3.20 eQEP Status Register (QEPSTS)
Figure 15-168. eQEP Status Register (QEPSTS)
15 8
Reserved
R-0
7 6 5 4 3 2 1 0
UPEVNT FIDF QDF QDLF COEF CDEF FIMF PCEF
R-0 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 15-143. eQEP Status Register (QEPSTS) Field Descriptions
Bit Field Value Description
15-8 Reserved 0 Always write as 0
7 UPEVNT Unit position event flag
0 No unit position event detected
1 Unit position event detected. Write 1 to clear.
6 FDF 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 (QEPCTMR)
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
1687
SPRUH73H–October 2011–Revised April 2013 Pulse-Width Modulation Subsystem (PWMSS)
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated
To Next Page
Loading...
Need help?
General
