Crystal Oscillator; Power Supply Decoupling; Figure 26. Six Layer Pcb Stack-Up Example - ST STM32F7 Series Application Notes

AN4661
8.2

Crystal oscillator

Use the application note: Oscillator design guide for STM8S, STM8A and STM32
microcontrollers (AN2867), for further guidance on how to layout and route crystal oscillator
circuits.
8.3

Power supply decoupling

An adequate power decoupling for STM32F7 Series is necessary to prevent an excessive
power noise and ground bounce noise. Please refer to
Figure 27
closer to pins and with less vias:
Recommended PCB routing guidelines for STM32F7 Series devices

Figure 26. Six layer PCB stack-up example

shows an example of placing bypass capacitors underneath STM32F7 Series
DocID027559 Rev 5
Section 1.2: Power supply scheme.
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