This could be due to the maximum input rise and fall time. For the STM32F1, it is 50 ns as indicated in Table 21 of the datasheet. In a MEMS oscillator, it can reach up to 100 or 200 ns.
The digital bypass mode is the same as the old bypass mode. The external user clock must comply with the specifications provided in Table 77 high-speed external user clock characteristics. (see STM32U575 datasheet).
When selecting your crystal, be sure to follow the recommendations in section 3.4 of the AN2867. Also refer to section 3.3 to calculate external capacitors. Regarding Rext, refer to this question: STM32L4R5 HSE Rext External Resistor
Hi @RKrec.2 Could you refer to AN2867 Rev16? Special focus on section 3.4, make sure that Gm_crit_max (MCU) > gm_crit (crystal). Also, section 3.3 to calculate the external capacitors then fine tune. As mentioned in RM0399 Rev 3, section 9.7.25, bef...
Hi @MP.3ramanathan Please refer to application note AN5557, Figure 2 gives an overview of the dual-core system architecture. Section 3.3 describes the dual-core boot, by default both core boot. Also you can refer to provided templates in STM32CubeH7...
