Hardware layout and configuration

UM2339

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UM2339 Rev 1

7.2

Embedded ST-LINK/V2

The ST-LINK/V2 programming and debugging tool is integrated on the STM8-SO8-DISCO

board.

The embedded ST-LINK/V2 can be used in 3 different ways:

•

Program/debug one on-board STM8 device by selecting it using the corresponding

solder bridges

•

Program/debug a STM8 device mounted on a DIL8 module plugged to the socket U3

•

Program/debug an external STM8 device mounted on a user application board using a

cable connected to SWIM connector (CN1)

The embedded ST-LINK/V2 supports only SWIM for STM8 devices. For information about

debugging and programming features refer to ST-LINK/V2 in-circuit debugger/programmer

for STM8 and STM32 User manual (UM1075), which describes in details all the ST-LINK/V2

features.

7.2.1

Using the ST-LINK/V2 to program/debug one on-board STM8 device

To program/debug one of the on-board STM8 device, solder bridges must be configured as

detailed in below table. In addition, no DIL8 module must be present on the socket U3 and

no external target must be connected to CN1.

Note:

Practically, only SB1, SB4 and SB7 are used to redirect the SWIM signal to the selected

STM8 device. But to prevent conflict on GPIOs used for the user push-button and LED, it is

preferable to also configure others solder bridges.

7.2.2

Using the ST-LINK/V2 to program/debug a STM8 device on a DIL8

module

To program/debug a STM8 device mounted on a DIL8 module plugged to the socket U3, it is

required to set all solder bridges OFF (SB1 to SB9) and no external target must be

connected to CN1. The DIL8 socket pinout is detailedTable 3.

Table 2. Selecting one on-board STM8

Selected STM8 device

Solder Bridge ON

Solder Bridge OFF

STM8S001J3M3 (U2)

SB1, SB2, SB3

SB4, SB5, SB6, SB7, SB8, SB9

STM8L001J3M3 (U7)

SB4, SB5, SB6

SB1, SB2, SB3, SB7, SB8, SB9

STM8L050J3M3 (U10)

SB7, SB8, SB9

SB1, SB2, SB3, SB4, SB5, SB6

Table 3. DIL8 socket (U3) pinout

Pin number

Pin name

Description

1

GPIO1/SWIM

Serial wire interface module (SWIM)

2

GPIO2

Not connected

3

GND

Ground

4

VDD

Power supply (+3.3 V)

5

GPIO3/LED

User LED