Texas Instruments TMS570LC4357 - Page 1974

X=N x P
P
QA
QB
QCLK
UPEVNT
QCAPCTL:CEN
Capture timer
control unit
(CTCU)
QCPRD
QCTMR
QCTMRLAT
QCPRDLAT
16
16
3-bit binary
divider
x1, 1/2, 1/4...,
1/128
CAPCLK
QCAPCTL:CCPS
3
VCLK3
16
0xFFFF
16
QEPSTS:COEF
4-bit binary
divider
x1, 1/2, 1/4...,
1/2048
QCLK
Rising/falling
edge detect
QDIR
QEPSTS:CDEF
QEPCTL:UTE
QUTMR
QUPRD
VCLK3
QFLG:UTO
UTIME
4
QCAPCTL:UPPS
UTOUT
QEPSTS:UPEVNT
UPEVNT
Basic Operation www.ti.com
1974
SPNU563A–March 2018
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Enhanced Quadrature Encoder Pulse (eQEP) Module
Figure 34-15. eQEP Edge Capture Unit
NOTE: The QCAPCTL[UPPS] prescaler should not be modified dynamically (such as switching the
unit event prescaler from QCLK/4 to QCLK/8). Doing so may result in undefined behavior.
The QCAPCTL[CPPS] prescaler can be modified dynamically (such as switching CAPCLK
prescaling mode from SYSCLK/4 to SYSCLK/8) only after the capture unit is disabled.
Figure 34-16. Unit Position Event for Low Speed Measurement (QCAPCTL[UPPS] = 0010)
A N - Number of quadrature periods selected using QCAPCTL[UPPS] bits