STM32L072X8 Datasheet, PDF (112/147 Pages) STMicroelectronics – Ultra-low-power 32-bit MCU ARM-based Cortex-M0+, up to 192KB Flash, 20KB SRAM, 6KB EEPROM, USB, ADC, DACs

Electrical characteristics
STM32L072xx
Table 77. SPI characteristics in voltage Range 3 ⁽¹⁾
Symbol
Parameter
Conditions
Min
Typ
Max Unit
f_SCK
1/t_c(SCK)
SPI clock frequency
Master mode
Slave mode
2
-
-
2⁽²⁾
MHz
Duty_(SCK)
Duty cycle of SPI clock
frequency
Slave mode
30
50
70
%
t_su(NSS)
t_h(NSS)
t_w(SCKH)
t_w(SCKL)
t_su(MI)
t_su(SI)
t_h(MI)
t_h(SI)
t_a(SO
t_dis(SO)
NSS setup time
NSS hold time
SCK high and low time
Data input setup time
Data input hold time
Data output access time
Data output disable time
Slave mode, SPI presc = 2 4*Tpclk
-
-
Slave mode, SPI presc = 2 2*Tpclk
-
-
Master mode
Tpclk-2 Tpclk Tpclk+2
Master mode
Slave mode
Master mode
Slave mode
Slave mode
Slave mode
1.5
-
6
-
13.5
-
16
-
30
-
40
-
-
-
-
-
ns
70
80
t_v(SO)
t_v(MO)
t_h(SO)
t_h(MO)
Data output valid time
Data output hold time
Slave mode
Master mode
Slave mode
Master mode
-
30
70
-
7
9
25
-
-
8
-
-
1. Guaranteed by characterization results.
2.
The
into
maximum SPI clock frequency in slave transmitter mode is
SCK low or high phase preceding the SCK sampling edge.
determined by
This value can
the
be
asuchmieovfetd^v(Sw^Oh⁾eanntdhet^suS^(MP^II⁾
which has to fit
communicates
with a master having t_su(MI) = 0 while Duty_(SCK) = 50%.
Figure 35. SPI timing diagram - slave mode and CPHA = 0
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