Datasheet

DIR
QPOSCMP
QPOSCNT
PCSOUT (active HIGH)
PCSPW
PCSPW
PCSPW
PCEVNT
POSCMP=2
0
1
2
3
4
3
2
1
0
1
2
3
4
3
2
1
0
eQEP counter
PCEVNT
PCSOUT (active HIGH)
PCSOUT (active LOW)
PCSPW
www.ti.com Basic Operation
For example, if QPOSCMP = 2, the position-compare unit generates a position-compare event on 1 to 2
transitions of the eQEP position counter for forward counting direction and on 3 to 2 transitions of the
eQEP position counter for reverse counting direction (see Figure 33-13).
Section 33.3.14 shows the layout of the eQEP Position-Compare Control Register (QPOSCTL) and
describes the QPOSCTL bit fields.
Figure 33-13. eQEP Position-compare Event Generation Points
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 33-14.
Figure 33-14. eQEP Position-compare Sync Output Pulse Stretcher
1689
SPNU562–May 2014 Enhanced QEP (eQEP) Module
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