Hardware layout and configuration

UM2339

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UM2339 Rev 1

7.3

Power supply (CN3)

The STM8-SO8-DISCO is designed to be powered using the ST-LINK/V2 USB connector

CN3.

7.4

LEDs (LD1 and LD2)

The STM8-SO8-DISCO features a user LED (LD1) connected to the pin 5 of the DIL8

module. To light on this LED, a high logic state must be output on the corresponding STM8

GPIO.

The tricolor LED (green, orange, red) LD2 (COM) provides information about ST-LINK

communication status:

•

Slow blinking Red/Off: at power-on before USB initialization

•

Fast blinking Red/Off: after the first correct communication between the PC and

ST-LINK/V2 (enumeration)

•

Red LED On: when the initialization between the PC and ST-LINK/V2-1 is complete

•

Green LED On: after a successful target communication initialization

•

Blinking Red/Green: during communication with target

•

Green On: communication finished and successful

•

Orange On: Communication failure

7.5

Push-button (B1)

The STM8-SO8-DISCO offers a user push-button (B1) connected to pin 7 of the DIL8

module. To retrieve the push-button state, the firmware must read the corresponding STM8

GPIO.

The use of the push-button depends on the STM8 device firmware.

Table 5. User LED port assignment

Selected STM8 device

GPIO assigned to user LED

STM8S001J3M3 (U2)

PA3/PB5

STM8L001J3M3 (U7)

PB3/PB5/PD0

STM8L050J3M3 (U10)

Table 6. User push-button port assignment

Selected STM8 device

GPIO assigned to user push-button

STM8S001J3M3 (U2)

PC3/PC4/PC5

STM8L001J3M3 (U7)

PB7/PC0

STM8L050J3M3 (U10)