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eQEP Registers

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33.3.12 eQEP Control Register (QEPCTL)

Figure 33-32. eQEP Control Register (QEPCTL) [offset = 2Ah]

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; R = Read only; -n = value after reset

Table 33-15. 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 disabled)

1h Does nothing (action 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 disabled)

1h Do nothing (action 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 disabled)

1 Initialize position counter (QPOSCNT=QPOSINIT). This bit is not cleared automatically

1700

Enhanced QEP (eQEP) Module SPNU562–May 2014

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