L4 R4: WCH ARM9 USBHS/Ethernet SoC (CH563/CH561)
CH563 是ARM9内核MCU，默认系统主频为100MHZ，最高可达130MHZ，224K FLASH、28K DATA FLASH、64K SRAM。
内置100M以太网MAC和PHY，支持10/100M全双工半双工，自动协商，线路自动转换等功能，高度集成的外设以及高性能，可以直接和网络终端如PC，嵌入式设备进行数据交互。
高速USB设备（全功能USB 2.0 ECHI主机），4组定时器、双异步串口、双SPI接口、ADC、唯一ID等。
CH563 集成硬件以太网，拥有大量接口和不俗的性能，适合网络应用场合。
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