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Figure 9-13. eQEP Position-compare Event Generation Points
eQEP counter
PCEVNT
PCSOUT (active HIGH)
PCSOUT (active LOW)
The pulse stretcher logic in the position-compare unit generates a programmable position-compare sync
pulse output on the position-compare match. In the event of a new position-compare match while a
previous position-compare pulse is still active, then the pulse stretcher generates a pulse of specified
duration from the new position-compare event as shown in
Figure 9-14. eQEP Position-compare Sync Output Pulse Stretcher
PCSOUT (active HIGH)
9.5
eQEP Edge Capture Unit
The eQEP peripheral includes an integrated edge capture unit to measure the elapsed time between the
unit position events as shown in
using the following equation:
v ( k ) +
t ( k ) * t ( k * 1 )
where,
SPRUH22I – April 2012 – Revised November 2019
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4
3
3
2
1
0
PCSPW
DIR
QPOSCMP
QPOSCNT
PCEVNT
Figure
9-15. This feature is typically used for low speed measurement
X
+ X
DT
Copyright © 2012–2019, Texas Instruments Incorporated
4
3
3
2
2
2
1
1
0
Figure
9-14.
PCSPW
PCSPW
C28 Enhanced QEP (eQEP) Module
eQEP Edge Capture Unit
POSCMP=2
1
0
PCSPW
(3)
835
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