Eqep Control (Qepctl) Register Field Descriptions - Texas Instruments Concerto F28M36 Series Technical Reference Manual

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Bits Name
15-14 FREE,
SOFT
13-12 PCRM
11-10 SEI
9-8 IEI
7 SWI
6 SEL
5-4 IEL
SPRUHE8E – October 2012 – Revised November 2019
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Table 9-4. eQEP Control (QEPCTL) Register Field Descriptions
Value Description
Emulation Control Bits
QPOSCNT behavior
00 Position counter stops immediately on emulation suspend
01 Position counter continues to count until the rollover
1x Position counter is unaffected by emulation suspend
QWDTMR behavior
00 Watchdog counter stops immediately
01 Watchdog counter counts until WD period match roll over
1x Watchdog counter is unaffected by emulation suspend
QUTMR behavior
00 Unit timer stops immediately
01 Unit timer counts until period rollover
1x Unit timer is unaffected by emulation suspend
QCTMR behavior
00 Capture Timer stops immediately
01 Capture Timer counts until next unit period event
1x Capture Timer is unaffected by emulation suspend
Position counter reset mode
00 Position counter reset on an index event
01 Position counter reset on the maximum position
10 Position counter reset on the first index event
11 Position counter reset on a unit time event
Strobe event initialization of position counter
00 Does nothing (action disabled)
01 Does nothing (action disabled)
10 Initializes the position counter on rising edge of the QEPS signal
11 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
Index event initialization of position counter
00 Do nothing (action disabled)
01 Do nothing (action disabled)
10 Initializes the position counter on the rising edge of the QEPI signal (QPOSCNT =
QPOSINIT)
11 Initializes the position counter on the falling edge of QEPI signal (QPOSCNT = QPOSINIT)
Software initialization of position counter
0 Do nothing (action disabled)
1 Initialize position counter (QPOSCNT=QPOSINIT). This bit is not cleared automatically
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
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.
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eQEP Registers
C28 Enhanced QEP (eQEP) Module
879