Hardware layout and configuration UM1724
22/55 DocID025833 Rev 4
5.7 OSC clock
5.7.1 OSC clock supply
There are four ways to configure the pins corresponding to external high-speed clock
external high-speed clock (HSE):
• MCO from ST-LINK: MCO output of ST-LINK MCU is used as input clock. This
frequency cannot be changed, it is fixed at 8 MHz and connected to PF0/PD0/PH0-
OSC_IN of STM32 microcontroller.
The following configuration is needed:
– SB54, SB55 OFF
– R35,R37
removed
– SB16, SB50
ON
• HSE oscillator on-board from X3 crystal (not provided): for typical frequencies and
its capacitors and resistors, please refer to STM32 microcontroller datasheet. The X3
crystal has the following characteristics: 8 MHz, 16PF, 20PPM, and DIP footprint.
The following configuration is needed:
– SB54, SB55 OFF
– R35, R37 soldered
– C33, C34 soldered with 20pF capacitors
– SB16, SB50
OFF
• Oscillator from external PF0/PD0/PH0: from an external oscillator through pin 29 of
the CN7 connector.
The following configuration is needed:
–SB55 ON
–SB50
OFF
– R35,R37 removed
• HSE not used: PF0/PD0/PH1 and PF1/PD1/PH1 are used as GPIO instead of Clock
The following configuration is needed:
– SB54 & SB55 ON
– R35 and R37 removed
– SB50 (MCO) OFF
There are two possible default configurations of the HSE pins depending on the version of
NUCLEO board hardware.
The board version MB1136 C-01 or MB1136 C-02 is mentioned on sticker placed on bottom
side of the PCB.
The board marking MB1136 C-01 corresponds to a board, configured for HSE not used.
The board marking MB1136 C-02 corresponds to a board, configured to use ST-LINK MCO
as clock input.
Part number example: 9SL8000016AFXHF0
Manufacturer: Hong Kong X'tals Limited
Website: http://www.hongkongcrystal.com
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