L1 R1: WCH 48MHz RISC-V MCU (CH32V003)
CH32V003 系列是基于青稞RISC-V2A内核设计的工业级通用微控制器，支持48MHz系统主频，具有宽压、单线调试、低功耗、超小封装等特点。CH32V003系列内置1组DMA控制器、1组10位模数转换ADC、1组运放比较器、多组定时器以及标准通讯接口USART、IIC、SPI等。
CH32V003 是标准的xxx003系列替换，用于最低端控制器
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