UCLK
CKPL = 0
CKPL = 1
SOMI
SIMO
t
SU,SI
t
HD,SI
t
VALID,SO
t
LOW/HIGH
1/f
UCxCLK
t
LOW/HIGH
t
STE,DIS
t
STE,ACC
STE
t
STE,LEAD
t
STE,LAG
UCMODEx = 01
UCMODEx = 10
t
HD,SO
83
SLAS826F – MARCH 2015 – REVISED MARCH 2017
Product Folder Links:
Specifications
Copyright © 2015–2017, Texas Instruments Incorporated
lists the characteristics of the eUSCI in SPI slave mode.
(1)
f
UCxCLK
= 1/(2t
LO/HI
) with t
LO/HI
≥
MAX(t
VALID,MO(Master)
+ t
SU,SI(eUSCI)
, t
SU,MI(Master)
+ t
VALID,SO(eUSCI)
)
For the master parameters t
SU,MI(Master)
and t
VALID,MO(Master)
, see the SPI parameters of the attached master.
(2)
Specifies the time to drive the next valid data to the SOMI output after the output changing UCLK clock edge. See the timing diagrams
in
and
.
(3)
Specifies how long data on the SOMI output is valid after the output changing UCLK clock edge. See the timing diagrams in
and
.
Table 5-39. eUSCI (SPI Slave Mode)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
V
CC
MIN
MAX
UNIT
t
STE,LEAD
STE lead time, STE active to clock
1.62 V
45
ns
3.7 V
20
t
STE,LAG
STE lag time, Last clock to STE inactive
1.62 V
1
ns
3.7 V
1
t
STE,ACC
STE access time, STE active to SOMI data out
1.62 V
25
ns
3.7 V
15
t
STE,DIS
STE disable time, STE inactive to SOMI high
impedance
1.62 V
18
ns
3.7 V
14
t
SU,SI
SIMO input data setup time
1.62 V
3
ns
3.7 V
2
t
HD,SI
SIMO input data hold time
1.62 V
0
ns
3.7 V
0
t
VALID,SO
SOMI output data valid time
(2)
UCLK edge to SOMI valid,
C
L
= 20 pF
1.62 V
35
ns
3.7 V
18
t
HD,SO
SOMI output data hold time
(3)
C
L
= 20 pF
1.62 V
10
ns
3.7 V
6
Figure 5-71. SPI Slave Mode, CKPH = 0