st72321j STMicroelectronics, st72321j Datasheet - Page 160

• Manufacturer Part Number: st72321j
• Description: 8-bit Mcu With Nested Interrupts, Flash, 10-bit Adc, 5 Timers, Spi, Sci, I2c Interface
• Manufacturer: STMicroelectronics

ST72321J
12.11 COMMUNICATION INTERFACE CHARACTERISTICS
12.11.1 SPI - Serial Peripheral Interface
Subject to general operating conditions for V
f
Figure 97. SPI Slave Timing Diagram with CPHA=0
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: 0.3xV
160/179
CPU
1/t
Symbol
t
t
w(SCKH)
w(SCKL)
t
t
t
t
t
t
t
t
t
dis(SO)
t
t
t
r(SCK)
f(SCK)
su(SS)
t
su(MI)
t
h(MO)
f
su(SI)
a(SO)
v(SO)
h(SO)
v(MO)
MISO
MOSI
h(SS)
h(MI)
, and T
c(SCK)
h(SI)
SCK
SS
CPHA=0
CPOL=0
CPHA=0
CPOL=1
OUTPUT
INPUT
INPUT
A
SPI clock frequency
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
unless otherwise specified.
see note 2
t
a(SO)
t
su(SS)
t
su(SI)
Parameter
MSB IN
t
t
w(SCKH)
w(SCKL)
MSB OUT
t
t
h(SI)
c(SCK)
t
DD
v(SO)
DD
Master
Slave
Slave
Slave
Master
Slave
Master
Slave
Master
Slave
Slave
Slave
Slave (after enable edge)
Master (before capture edge)
,
BIT6 OUT
and 0.7xV
Refer to I/O port characteristics for more details on
the input/output alternate function characteristics
(SS, SCK, MOSI, MISO).
3)
Conditions
DD
BIT1 IN
.
t
f
f
h(SO)
CPU
CPU
=8MHz
=8MHz
t
t
r(SCK)
f(SCK)
f
CPU
0.0625
LSB IN
see I/O port pin description
0.25
0.25
Min
120
120
100
100
100
100
100
90
LSB OUT
0
0
0
/128
t
h(SS)
f
f
CPU
CPU
Max
120
240
90
2
4
/4
/2
t
dis(SO)
Unit
t
MHz
CPU
ns
note 2
see