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SLAS826F – MARCH 2015 – REVISED MARCH 2017
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Specifications
Copyright © 2015–2017, Texas Instruments Incorporated
5.25.9 eUSCI
lists the supported clock frequencies of the eUSCI in UART mode.
Table 5-35. eUSCI (UART Mode) Clock Frequency
PARAMETER
TEST CONDITIONS
VCORE
VCC
MIN
MAX UNIT
f
eUSCI
eUSCI input clock frequency
Internal: SMCLK,
External: UCLK,
Duty cycle = 50% ±10%
1.2 V
12
MHz
1.4 V
24
f
BITCLK
BITCLK clock frequency
(equals baud rate in MBaud)
1.2 V
5
MHz
1.4 V
7
lists the characteristics of the eUSCI in UART mode.
(1)
Pulses on the UART receive input (UCxRX) that are shorter than the UART receive deglitch time are suppressed. Thus the selected
deglitch time can limit the maximum useable baud rate. To ensure that pulses are correctly recognized, their duration should exceed the
maximum specification of the deglitch time.
Table 5-36. eUSCI (UART Mode) Switching Characteristics
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
t
t
UART receive deglitch time
(1)
UCGLITx = 0
5
20
ns
UCGLITx = 1
20
60
UCGLITx = 2
30
100
UCGLITx = 3
50
150
lists the supported clock frequencies of the eUSCI in SPI master mode.
Table 5-37. eUSCI (SPI Master Mode) Clock Frequency
PARAMETER
CONDITIONS
V
CC
MIN
TYP
MAX UNIT
f
eUSCI
eUSCI input clock frequency
SMCLK,
Duty cycle = 50% ±10%
VCORE = 1.2 V
12
MHz
VCORE = 1.4 V
24