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eQEP Registers

Table 4. eQEP Control (QEPCTL) Register Field Descriptions (continued)

Bits Name Value Description

6 SEL Strobe event latch of position counter

0 The position counter is latched on the rising edge of QEPS strobe (QPOSSLAT =

POSCCNT). Latching on the falling edge can be done by inverting the strobe input using the

QSP bit in the QDECCTL register.

1 Clockwise Direction:

Position counter is latched on rising edge of QEPS strobe

Counter Clockwise Direction:

Position counter is latched on falling edge of QEPS strobe

5-4 IEL Index event latch of position counter (software index marker)

00 Reserved

01 Latches position counter on rising edge of the index signal

10 Latches position counter on falling edge of the index signal

11 Software index marker. Latches the position counter and quadrature direction flag on index

event marker. The position counter is latched to the QPOSILAT register and the direction flag

is latched in the QEPSTS[QDLF] bit. This mode is useful for software index marking.

3 QPEN Quadrature position counter enable/software reset

0 Reset the eQEP peripheral internal operating flags/read-only registers. Control/configuration

registers are not disturbed by a software reset.

1 eQEP position counter is enabled

2 QCLM eQEP capture latch mode

0 Latch on position counter read by CPU. Capture timer and capture period values are latched

into QCTMRLAT and QCPRDLAT registers when CPU reads the QPOSCNT register.

1 Latch on unit time out. Position counter, capture timer and capture period values are latched

into QPOSLAT, QCTMRLAT and QCPRDLAT registers on unit time out.

1 UTE eQEP unit timer enable

0 Disable eQEP unit timer

1 Enable unit timer

0 WDE eQEP watchdog enable

0 Disable the eQEP watchdog timer

1 Enable the eQEP watchdog timer

Figure 23. eQEP Position-compare Control (QPOSCTL) Register

15 14 13 12 11 8

PCSHDW PCLOAD PCPOL PCE PCSPW

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

7 0

PCSPW

R/W-0

LEGEND: R/W = Read/Write; R = Read only; - n = value after reset

Table 5. eQEP Position-compare Control (QPOSCTL) Register Field Descriptions

Bit Name Description

15 PCSHDW Position-compare shadow enable

0 Shadow disabled, load Immediate

1 Shadow enabled

14 PCLOAD Position-compare shadow load mode

0 Load on QPOSCNT = 0

SPRUG05A – August 2008 – Revised December 2008 Enhanced QEP (eQEP) Module 31

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