Hardware layout UM1670
20/32 UM1670 Rev 4
6.12 OSC clock
6.12.1 OSC clock supply
The following information indicates all configurations for clock supply selection.
• MCO from ST-LINK (from MCO of the STM32F429ZIT6)
This frequency cannot be changed, it is fixed at 8 MHz and connected to PH0-OSC_IN
of the STM32F429ZIT6. The configuration needed is:
– SB18 closed, SB19 open, R56 removed
– SB20, R57, C20, C21, X3 = do not care
• Oscillator on board (from X3 crystal)
For typical frequencies and its capacitors and resistors, refer to the STM32F429ZIT6
datasheet. The configuration needed is:
– SB18, SB19, SB20 open
– R56, R57, C20, C21, X3 soldered
• Oscillator from external PH0 (from external oscillator through pin 10 of the P2
connector)
The configuration needed is:
– SB19 closed, SB18 open, R56 removed
– SB20, R57, C20, C21, X3 = do not care
• No external oscillator (from internal oscillator HSI only).
PH0 and PH1 can be used as GPIO. The configuration needed is:
– SB18 open, SB19 closed, SB20 closed, R56 removed, R57 removed
– C20, C21, X3 = do not care
6.12.2 OSC 32 kHz clock supply
The following information indicates all configurations for the 32 kHz clock supply selection.
• Oscillator on board (from X2 Crystal, not provided).
The configuration needed is:
– SB16 open, SB17 open
– R53, R54, C23, C24, X2 soldered
• Oscillator from external PC14 (from external oscillator through pin 9 of P1 connector)
The configuration needed is:
– SB16 closed, R53 removed
– SB17, R54, C23, C24, X2 = do not care
• No external oscillator (PC14 and PC15 can be used as GPIO.
The configuration needed is:
– SB16 closed, SB17 closed, R53 removed, R54 removed
– C23, C24, X2 = do not care
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