Mini Stm32f103rbt6 Arm Stm32 System Development Board Module Cortex-m3 Iic Eeprom Rtc Crystal Sdio Card Holder Led Mc-306 Diy - Connectors - AliExpress
Bypass vs Crystal ceramic
Crystal Oscillator Verification
Share a single 8Mhz crystal between a 72mhz STM32F3, and 48 mhz STM32F0