STM32F4DISCOVERY datasheet(19/42 Pages) ETC2

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UM1472

Hardware and layout

4.10

OSC clock

4.10.1

OSC clock supply

If PH0 and PH1 are only used as GPIOs instead of as a clock, then SB13 and SB14 are

closed and R24, R25 and R68 are removed.

•

MCO from ST-LINK. From MCO of the STM32F103. This frequency cannot be

changed, it is fixed at 8 MHz and connected to PH0-OSC_IN of the STM32F407VGT6.

Configuration needed:

–

SB13, SB14 OPEN

–

R25(a) removed

–

R68(a) soldered

•

Oscillator onboard. From X2 crystal. For typical frequencies and its capacitors and

resistors, please refer to the STM32F407VGT6 Datasheet. Configuration needed:

–

SB13, SB14 OPEN

–

R25(a) soldered

–

R68(a) removed

•

Oscillator from external PH0. From external oscillator through pin 7 of the P2

connector. Configuration needed:

–

SB13 closed

–

SB14 closed

–

R25 and R68 removed

4.10.2

OSC 32 KHz clock supply

If PC14 and PC15 are only used as GPIOs instead of as a clock, then SB15 and SB16 are

closed, and R21 and R22 are removed.

•

Oscillator onboard. From X1 Crystal (not provided). Configuration needed:

–

SB15, SB16 OPEN

–

C16, C27, R21 and R22 soldered.

•

Oscillator from external PC14. From external oscillator trough the pin 9 of P2

connector. Configuration needed:

–

SB16 closed

–

SB15 closed

–

R21 and R22 removed

a. As the frequency supplied by X2 is the same as MCO (8 MHz) R25 and R68 are soldered.

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