140
TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
SPRS698F – NOVEMBER 2010 – REVISED MARCH 2016
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Detailed Description
Copyright © 2010–2016, Texas Instruments Incorporated
6.9.13.1
eQEP Electrical Data/Timing
Table 6-68
shows the eQEP timing requirement and
Table 6-69
shows the eQEP switching
characteristics.
(1)
For an explanation of the input qualifier parameters, see
Table 6-76
.
(2)
Refer to the
TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066, TMS320F28065, TMS320F28064, TMS320F28063,
TMS320F28062 Piccolo MCUs Silicon Errata
(
SPRZ342
) for limitations in the asynchronous mode.
Table 6-68. Enhanced Quadrature Encoder Pulse (eQEP) Timing Requirements
(1)
MIN
MAX
UNIT
t
w(QEPP)
QEP input period
Asynchronous
(2)
/Synchronous
2t
c(SCO)
cycles
With input qualifier
2[1t
c(SCO)
+ t
w(IQSW)
]
t
w(INDEXH)
QEP Index Input High time
Asynchronous
(2)
/Synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+t
w(IQSW)
t
w(INDEXL)
QEP Index Input Low time
Asynchronous
(2)
/Synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
t
w(STROBH)
QEP Strobe High time
Asynchronous
(2)
/Synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
t
w(STROBL)
QEP Strobe Input Low time
Asynchronous
(2)
/Synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+t
w(IQSW)
Table 6-69. eQEP Switching Characteristics
over recommended operating conditions (unless otherwise noted)
PARAMETER
MIN
MAX
UNIT
t
d(CNTR)xin
Delay time, external clock to counter increment
4t
c(SCO)
cycles
t
d(PCS-OUT)QEP
Delay time, QEP input edge to position compare sync output
6t
c(SCO)
cycles
