Hardware layout and configuration
UM1932
14/31
UM1932 Rev 4
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 32F469IDISCOVERY 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
®
compatible connector CN6 pin 3
•
Extension connector CN12 pin 4
JP2
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
®
compatible connector
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):
Table 3. Power related jumpers (continued)
Jumper,
solder bridge
Description
