Osc Clock; Osc Clock Supply; Osc 32 Khz Clock Supply - ST STM32F3DISCOVERY User Manual

Hardware layout and configuration
6.10

OSC clock

6.10.1

OSC clock supply

The following information indicates all configurations for clock supply selection:
•
MCO from ST-LINK. From MCO of the STM32F103C8T6. This frequency cannot be
changed, it is fixed at 8 MHz and connected to PF0-OSC_IN of the STM32F303VCT6.
Configuration needed:
–
–
• Oscillator on board. From X2 crystal (not provided). For typical frequencies and its
capacitors and resistors, refer to the STM32F303VCT6 Datasheet. Configuration
needed:
–
–
•
Oscillator from external PF0. From external oscillator through pin 5 of the P2
connector. Configuration needed:
–
–
•
No external oscillator. From Internal oscillator HSI only. PF0 and PF1 can be used as
GPIO. Configuration needed:
–
–
6.10.2

OSC 32 kHz clock supply

The following information indicates all the configurations for the 32 kHz clock supply
selection:
•
Oscillator on board. From X3 Crystal (not provided). Configuration needed:
–
–
•
Oscillator from external PC14. From external oscillator through the pin 7 of P2
connector. Configuration needed:
–
–
•
No external oscillator. PC14 and PC15 can be used as GPIO. Configuration needed:
–
–
20/36
SB12 closed, SB17 open, R33 removed
SB18, R32, C22, C23, X2 = do not care
SB12, SB17, SB18 open
R32, R33, C22, C23, X2 soldered
SB12 open, SB17 closed, R33 removed
SB18, R32, C22, C23, X2 = do not care
SB12 open, SB17 closed, SB18 closed, R32 removed, R33 removed
C22, C23, X2 = do not care
SB14 open, SB16 open.
R29, R30, C14, C26, X3 soldered.
SB14 closed, R29 removed
SB16, R30, C14, C26, X3 = do not care
SB14 closed, SB16 closed, R29 removed, R30 removed.
C14, C26, X3 = do not care.
UM1570 Rev 6
UM1570