STM8S005K6 STM8S005C6
Electrical characteristics
The reset network shown in the following figure protects the device against parasitic resets.
The user must ensure that the level on the NRST pin can go below VIL(NRST) max. (see Table
40: NRST pin characteristics ), otherwise the reset is not taken into account internally.
For power consumption sensitive applications, the external reset capacitor value can be
reduced to limit the charge/discharge current. If NRST signal is used to reset external circuitry,
attention must be taken to the charge/discharge time of the external capacitor to fulfill the
external devices reset timing conditions. Minimum recommended capacity is 100 nF.
Figure 37: Recommended reset pin protection
External
reset
circuit
(optional)
VDD
0.1 μF
NRST
RPU
STM8
Filter
Internal reset
9.3.9
SPI serial peripheral interface
Unless otherwise specified, the parameters given in the following table are derived from tests
performed under ambient temperature, fMASTER frequency and VDD supply voltage conditions.
tMASTER = 1/fMASTER.
Refer to I/O port characteristics for more details on the input/output alternate function
characteristics (NSS, SCK, MOSI, MISO).
Table 41: SPI characteristics
Symbol
Parameter
Conditions
Min
Max Unit
fSCK1
tc(SCK)
SPI clock
frequency
Master mode
Slave mode
0
8
MHz
0
6
tr(SCK)
tf(SCK)
SPI clock rise Capacitive load: C = 30 pF
and fall time
25
ns
tsu(NSS) (1)
NSS setup time Slave mode
4x
tMASTER
ns
th(NSS) (1)
NSS hold time Slave mode
70
ns
DocID022186 Rev 3
81/103