ST72254G2B3 データシートの表示（PDF） - STMicroelectronics
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ST72254G2B3
STMicroelectronics
ST72254G2B3 Datasheet PDF : 135 Pages
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ST72104G, ST72215G, ST72216G, ST72254G
13.11 COMMUNICATION INTERFACE CHARACTERISTICS
13.11.1 SPI - Serial Peripheral Interface
Subject to general operating conditions for VDD,
fOSC, and TA unless otherwise specified.
Refer to I/O port characteristics for more details on
the input/output alternate function characteristics
(SS, SCK, MOSI, MISO).
Symbol
Parameter
fSCK
1/tc(SCK)
SPI clock frequency
tr(SCK)
tf(SCK)
tsu(SS)
th(SS)
tw(SCKH)
tw(SCKL)
tsu(MI)
tsu(SI)
th(MI)
th(SI)
ta(SO)
tdis(SO)
tv(SO)
th(SO)
tv(MO)
th(MO)
SPI clock rise and fall time
SS setup time
SS hold time
SCK high and low time
Data input setup time
Data input hold time
Data output access time
Data output disable time
Data output valid time
Data output hold time
Data output valid time
Data output hold time
Master
Slave
Conditio ns
fCPU=8MHz
fCPU=8MHz
Min
fCPU/128
0.0625
0
Max
fCPU/4
2
fCPU/2
4
Unit
MHz
see I/O port pin description
Slave
Slave
Master
Slave
Master
Slave
Master
Slave
Slave
Slave
Slave (after enable edge)
Master (before capture edge)
120
120
100
90
100
100
100
ns
100
0
120
240
120
0
0.25
0.25
tCPU
Figure 90. SPI Slave Timing Diagram with CPHA=0 3)
SS INPUT
CPHA=0
CPOL=0
CPHA=0
CPOL=1
tsu(SS)
ta(SO)
MISO OUTPUT
see note 2
tsu(SI)
tc(SCK)
ttww((SSCCKKHL))
tv(SO)
MSB OUT
th(SI)
BIT6 OUT
th(SS)
th(SO)
tr(SCK)
tf(SCK)
LSB OUT
tdis(SO)
see
note 2
MOSI INPUT
MSB IN
BIT1 IN
LSB IN
Notes:
1. Data based on design simulation and/or characterisation results, not tested in production.
2. When no communication is on-going the data output line of the SPI (MOSI in master mode, MISO in slave mode) has
its alternate function capability released. In this case, the pin status depends on the I/O port configuration.
3. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD.
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