Clock Source; Hse Clock Source; Lse Clock Source; Reset Source - STMicroelectronics STM32F469I-DISCO User Manual

UM1932
Jumper,
solder bridge
JP2
4.3

Clock source

4.3.1

HSE clock source

By default the HSE clock source of the STM32F469NIH6 is the 8 MHz crystal X2. In that
case, zero-ohm R131 is soldered, solder bridge SB19 is open.
It is possible to replace the crystal X2 by the 8 MHz output MCO from the circuit
ST-LINK/V2-1 U3. In that case, 100-ohm resistor R35 must be soldered, zero-ohm R131
must be removed, solder bridge SB19 must be closed. C26 is not necessary and remains
not populated.
4.3.2

LSE clock source

The 32.768 kHz crystal X3 is the clock source for the embedded RTC.
4.4

Reset source

The reset signal of STM32F469I-DISCO board is low active and the reset sources include:
•
Reset button B1, providing solder bridge SB1 is closed (default setting)
•
Embedded ST-LINK/V2-1, providing solder bridge SB2 is closed (default setting)
•
ARDUINO
•
Extension connector CN12 pin 4
Table 3. Power related jumpers (continued)
To supply the board from the User USB FS connector USB connector CN13, JP2
should be set as shown to the right:
To supply the board from the pin 8 VIN of the ARDUINO
CN6, JP2 should be set as shown to the right:
To supply the board from pin1 of extension connector CN12 or from pin4 of the
®
ARDUINO compatible connector CN6, JP2 should be set as shown to the right (no
jumper):
®
compatible connector CN6 pin 3
UM1932 Rev 3
Hardware layout and configuration
Description
®
compatible connector
15/30
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