STM32 is a kind of 32 bit single chip microcomputer, which adopts the Cortex-M3 core specially designed for embedded application by Italian semiconductor<br>AVR, PLC and STM32 have more internal registers and peripheral functions. The internal end of STM32 microcontroller is connected by AHB<br>Cortex-M3 is the kernel, and the other end is the bus, which is mainly used to expand the external memory. When the internal memory accesses the external memory, it first transmits the signal to AHB<br>Bus, through FSMC converted to meet the requirements of external memory communication signal, and then the converted signal is sent to the corresponding pin of external memory, art operation, avoid system crash<br>
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