UM1037 datasheet(9/46 Pages) STMICROELECTRONICS

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UM1037

Hardware layout and configuration

Doc ID 18294 Rev 1

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2.3

Clock source

Two clock sources are available on STM8L1528-EVAL evaluation board for STM8L152M8T6

and the embedded RTC.

●

X1, 32 KHz crystal for embedded RTC

●

X2, 16 MHz crystal with socket for STM8L152M8T6 microcontroller, it can be removed

from its socket when the internal RC oscillator is used.

2.4

Reset source

The reset signal of STM8L1528-EVAL evaluation board is low active and the reset sources

include:

●

Reset button B1

●

Debugging tools from SWIM connector CN5 and CN8

●

Daughter board from CN4

●

Embedded ST-LINK/V2

●

RS232 connector CN7 for ISP.

Table 3.

Clock source related solder bridges

Solder bridge

Description

SB8

PC5 is connected to 32 KHz crystal when SB8 is set as pad1 (dot mark on

silkscreen) connected to pad2 (default setting).

PC5 is connected to extension connector CN4 when SB8 is set as pad2

connected to pad3.

SB9

PC6 is connected to 32KHz crystal when SB9 is set as pad2 connected to

pad3 (default setting).

PC6 is connected to extension connector CN4 when SB9 is set as pad1

(dot mark on silkscreen) connected to pad2.

SB11,SB12

IO port PA2 and PA3 can be used as GPIO on extension connector by

closing solder bridges SB11 and SB12 when crystal X2 was removed from

its socket.

The solder bridges SB11 and SB12 should be kept open by default.

Table 4.

Reset related jumpers

Jumper

Description

JP8

The board Reset is managed by pin 8 of connector CN7 (RS232 CTS

signal) when JP8 is closed. This configuration is used for boot loader

application only.

Default Setting: Not fitted.

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