Datasheet

Electrical characteristics
STM8S105xx
Figure 39: Typical NRST pull-up current vs VDD @ 4 temperatures
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 V
IL(NRST)
max. (see
Table 38: "I/O static 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 40: Recommended reset pin protection
10.3.9 SPI serial peripheral interface
Unless otherwise specified, the parameters given in the following table are derived from
tests performed under ambient temperature, f
MASTER
frequency and V
DD
supply voltage
conditions. t
MASTER
= 1/f
MASTER
.
Refer to I/O port characteristics for more details on the input/output alternate function
characteristics (NSS, SCK, MOSI, MISO).
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