UM0629

STM8L1/L2 motherboard

Doc ID 15312 Rev 2

9/26

2.2

Reset source

The reset signal of the motherboard is low active. Reset sources include:

●

Reset button B1.

●

Debugging tools from connectors CN5, CN6.

The reset pin PA1 of the STM8L101 is either connected to the reset button B1 or to GND by

the setting of jumper JP1:

2.3

Audio

The motherboard supports both audio recording and playback, but audio recording

components (U11 microphone and U12 amplifier) cannot be used with the STM8L101.

The speaker can be disabled or enabled by the setting of jumper JP10.

Audio volume can be adjusted using the potentiometer RV2.

Table 2.

Reset related jumpers

Jumper

Description

Setting

JP1

PA1 is connected to GND when JP1 is set as shown to the right:

This configuration is reserved for internal use only.

PA1 is connected to Reset button when JP1 is set as shown to the right:

(default setting).

This jumper position is called Alone on the silk-screen.

1 2 3

1 2 3

Table 3.

Audio related jumpers

Jumper

Description

Setting

JP10

Audio power amplifier TS4871 is forced on standby mode when JP10 is

not fitted.

Default setting: fitted.

JP9

Either beeper or PWM output can be selected as a source of speaker

by setting jumper JP9.

The beeper is connected to speaker when JP9 is set as shown to the

right: (Beep position on the silk-screen).

The PWM output is connected to speaker when JP9 is set as shown to

the right: (PSW position on the silk-screen) (default setting).

1 2 3

1 2 3