UM1537 datasheet(13/52 Pages) STMICROELECTRONICS

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UM1537

Hardware layout and configuration

Doc ID 023059 Rev 1

13/52

2.3

Clock source

Two clock sources are available on the STM320518-EVAL evaluation board for

STM32F051R8T6 and RTC embedded.

●

X1, 8 MHz crystal with a socket for the STM32F051R8T6 microcontroller. It can be

removed from the socket when the internal RC clock is used.

●

X2, 32 kHz crystal for embedded RTC.

2.4

Reset source

The reset signal of the STM320518-EVAL evaluation board is low active and the reset

sources include the following.

●

Reset button B1

●

Debugging tools from SWD connector CN10 and CN9

●

Daughterboard from CN6

●

Embedded ST-LINK/V2

●

RS232 connector CN7 for ISP.

Note:

The jumper JP6 is to be closed for RESET handled by pin8 of the RS-232 connector CN7

(CTS signal). Refer to Section 2.7 information.

Table 5.

8 MHz crystal X1 related solder bridges

Jumper

Description

SB13

PF0 is connected to an 8 MHz crystal when SB13 is open (default setting).

PF0 is connected to an extension connector CN6 when SB13 is closed. In such a

case, C34 and X1 must be removed.

SB14

PF1 is connected to an 8 MHz crystal when SB14 is open (default setting).

PF1 is connected to an extension connector CN6 when SB14 is closed. In such a

case, R59 must be removed to avoid disturbance due to the 8 MHz quartz.

Table 6.

32 kHz crystal X2 related solder bridges

Jumper

Description

SB9

PC14 is connected to a 32 kHz crystal when SB9 is open (default setting).

PC14 is connected to an extension connector CN5 when SB9 is closed. In such a

case, R57 must be removed to avoid disturbance due to the 32 kHz quartz.

SB10

PC15 is connected to a 32 kHz crystal when SB10 is open (default setting).

PC15 is connected to an extension connector CN5 when SB10 is closed. In such a

case, R58 must be removed to avoid disturbance due to the 32 kHz quartz.

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