
Electrical characteristics ST72321xx-Auto
212/243 Doc ID 13829 Rev 1
Figure 93. SPI slave timing diagram with CPHA = 0
(1)
1. Measurement points are done at CMOS levels: 0.3xV
DD
and 0.7xV
DD
.
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.
Figure 94. SPI slave timing diagram with CPHA = 1
(1)
1. Measurement points are done at CMOS levels: 0.3xV
DD
and 0.7xV
DD
.
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 of the I/O port configuration.
SS
INPUT
SCK
INPUT
CPHA=0
MOSI
INPUT
MISO
OUTPUT
CPHA=0
t
c(SCK)
t
w(SCKH)
t
w(SCKL)
t
r(SCK)
t
f(SCK)
t
v(SO)
t
a(SO)
t
su(SI)
t
h(SI)
MSB OUT
MSB IN
BIT6 OUT
LSB IN
LSB OUT
See note 2
CPOL=0
CPOL=1
t
su(SS)
t
h(SS)
t
dis(SO)
t
h(SO)
See
note 2
BIT1 IN
SS
INPUT
SCK
INPUT
CPHA=1
MOSI
INPUT
MISO
OUTPUT
CPHA=1
t
w(SCKH)
t
w(SCKL)
t
r(SCK)
t
f(SCK)
t
a(SO)
t
su(SI)
t
h(SI)
MSB OUT BIT6 OUT
LSB OUT
See
CPOL=0
CPOL=1
t
su(SS)
t
h(SS)
t
dis(SO)
t
h(SO)
See
note 2note 2
t
c(SCK)
HZ
t
v(SO)
MSB IN
LSB IN
BIT1 IN
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