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ESP32C3-Core
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F103_CAN
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Special Function Register
特殊功能寄存器组
特殊寄存器组 xPSR、PRIMASK、FAULTMASK、BASEPRI 以及 CONTROL 都是 CM3 内核的寄存器，CM3 定义的访问他们的方式是只能通过
MRS
和
MSR
指令
