Hardware layout and configuration UM2411
18/61 UM2411 Rev 2
5.3 Clock references
Two clock references (X2 and X3) are available on the STM32H747I-DISCO for the
STM32H747XIH6 target microcontroller. The two other clock sources (X1 and X4) are for
the peripherals:
• 24 MHz oscillator X1, for USB OTG HS PHY and camera module (daughter board)
• 25 MHz oscillator X2, for main clock generator and Ethernet PHY
• 32.768 kHz crystal X3, for embedded RTC
• 25 MHz oscillator X4, for STLINK-V3E only
The main clock can also be generated using an internal RC oscillator. The X2 reference
clock must be disconnected by removing resistor R73 when the internal RC clock is used.
5.4 Reset Source
The general reset of the STM32H747I-DISCO board is active low. The reset sources are:
• Reset button B1
• STDC14 connector CN13 and TAG connector CN16 (reset from debug tools)
• Arduino™ Uno shield board through connector CN8
• Embedded STLINK-V3E
5.5 Audio
A WM8994 codec is connected to the SAI interface of the STM32H747XIH6. It supports the
TDM feature of the SAI port. The TDM feature enables the STM32H747XIH6 to
simultaneously stream two independent stereo audio channels to two separate stereo
analog audio outputs. The codec communicates with the STM32H747XIH6 via the I2C4
bus, which is shared with the DSI
SM
LCD, camera module, Arduino™ Uno connectors, and
STMod+ connector.
JP3
V
DD_MCU
connection
Default setting.
V
DD_MCU
(VDD terminals of
STM32H747XIH6) is connected to fixed
+3.3 V.
V
DD_MCU
(VDD terminals of
STM32H747XIH6) is not connected to
fixed +3.3 V
Table 3. Power-supply related jumper and solder bridge settings (continued)
Jumper / Solder bridge Setting Configuration
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