Texas Instruments TMS570LC4357

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1983
SPNU563A–March 2018
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Enhanced Quadrature Encoder Pulse (eQEP) Module
34.3.12 eQEP Control Register (QEPCTL)
Figure 34-32. eQEP Control Register (QEPCTL) [offset = 28h]
15 14 13 12 11 10 9 8
FREE SOFT PCRM SEI IEI
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
7 6 5 4 3 2 1 0
SWI SEL IEL QPEN QCLM UTE WDE
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; -n = value after reset
Table 34-15. eQEP Control Register (QEPCTL) Field Descriptions
Bits Name Value Description
15-14 FREE, SOFT Emulation control bits.
QPOSCNT behavior:
0 Position counter stops immediately on emulation suspend.
1h Position counter continues to count until the rollover.
2h-3h Position counter is unaffected by emulation suspend.
QWDTMR behavior:
0 Watchdog counter stops immediately.
1h Watchdog counter counts until WD period match roll over.
2h-3h Watchdog counter is unaffected by emulation suspend.
QUTMR behavior:
0 Unit timer stops immediately.
1h Unit timer counts until period rollover.
2h-3h Unit timer is unaffected by emulation suspend.
QCTMR behavior:
0 Capture timer stops immediately.
1h Capture timer counts until next unit period event.
2h-3h Capture timer is unaffected by emulation suspend.
13-12 PCRM Position counter reset mode.
0 Position counter reset on an index event.
1h Position counter reset on the maximum position.
2h Position counter reset on the first index event.
3h Position counter reset on a unit time event.
11-10 SEI Strobe event initialization of position counter.
0 Does nothing (action is disabled).
1h Does nothing (action is disabled).
2h Initializes the position counter on rising edge of the QEPS signal.
3h Clockwise Direction: Initializes the position counter on the rising edge of QEPS strobe.
Counter Clockwise Direction: Initializes the position counter on the falling edge of QEPS strobe.
9-8 IEI Index event initialization of position counter.
0 Do nothing (action is disabled).
1h Do nothing (action is disabled).
2h Initializes the position counter on the rising edge of the QEPI signal (QPOSCNT = QPOSINIT).
3h Initializes the position counter on the falling edge of QEPI signal (QPOSCNT = QPOSINIT).
7 SWI Software initialization of position counter.
0 Do nothing (action is disabled).
1 Initialize position counter (QPOSCNT=QPOSINIT). This bit is not cleared automatically.