Clock Sources; Table 6. 8-Mhz Crystal (X2-Related Solder Bridge); Table 7. 32-Khz Crystal (X1-Related Solder Bridge) - ST STM32373C-EVAL User Manual

UM1564
Note: The recommended AC220 V to DC5 V power adapter is PSU-5V2A. It is not included with
the board but can be ordered from ST as a separate item. You can also use another
equivalent 5 V power adapter (polarity compatible with CN18) to power the STM32373C-
EVAL board via the CN18 power jack on the board. To order the recommended power
supply, use order code PSU-5V2A.
2.4

Clock sources

Two clock sources are available on the STM32373C-EVAL evaluation board for use with the
STM32F373VCT6 microcontroller and embedded real-time clock (RTC). They are:
●
8-MHz crystal (X2) with socket clock source for the STM32F373VCT6 microcontroller.
It can be removed from the socket when an internal RC clock is used (see
●
32-KHz crystal (X1) for use with an embedded RTC (see
Table 6.
Solder bridge
SB23
SB24
Table 7.
Solder bridge
SB25
SB26
8-MHz crystal (X2-related solder bridge)
When SB23 is open, PF0 is connected to the 8-MHz crystal oscillator.
This is the default setting.
When SB23 is closed, PF0 is connected to the extension connector CN14. In this
case, C18 and the X2 pin must be removed to avoid disturbance due to the 8-Mhz
quartz.
When SB24 is open, PF1 is connected to the 8-MHz crystal oscillator.
This is the default setting.
When SB24 is closed, PF1 is connected to the extension connector CN14. In this
case R38 must be removed to avoid disturbance due to the 8-Mhz quartz.
32-KHz crystal (X1-related solder bridge)
When SB25 is open, PC14 is connected to the 32-KHz crystal oscillator.
This is the default setting.
When SB25 is closed, PC14 is connected to the extension connector CN13. In this
case, R36 must be removed to avoid disturbance due to the 32-Khz quartz.
When SB26 is open, PC15 is connected to 32-KHz crystal.
This is the default setting.
When SB26 is closed, PC15 is connected to the extension connector CN13. In this
case, R37 must be removed to avoid disturbance due to the 32-Khz quartz.
Doc ID 023566 Rev 1
Hardware layout and configuration
Table 7).
Description
Description
Table 6).
15/66