The basic system of STM32 mainly involves the following parts: 1. Power supply 1) Regardless of whether the analog part and AD part are used, the VCC and GND, VDDA, VSSA, and Vref (if the package has this pin) of the MCU periphery must be connected and cannot be left floating; 2) For each set of corresponding VDD and GND, at least one 104 ceramic capacitor should be placed for filtering, and the capacitor should be placed as close to the MCU as possible; 2. Reset and startup selection 1) The Boot pin has nothing to do with JTAG. It is only used to determine the starting address of the execution code after the MCU is started; 2) In circuit design, the Boot pin may not be used, but it is required to connect an external resistor to the ground or power supply, and it must not be left floating;
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