1、The most basic circuits based on MCU are onboard, such as crystal oscillator circuit, power conversion circuit and USB port. The core board leads to commonly used I/O resources. 2、Added EEPROM, memory card/Mrico memory card and SPIFlsh peripherals, and reserved NandFlash peripheral pads to expand the storage circuit. 3、The SWD simulation debugging download interface is lead out, and the debugging simulation downloader downloads, convenient and simple. It uses the Mirco USB interface commonly used in smart phones, which is easy to use and can be used for USB communication and power supply. 4、A low-load RTC crystal oscillator solution is adopted, which largely avoids the problem of RTC not vibrating due to the use of cheap cylindrical crystal oscillators. 5、Equipped with high‑quality 2.54mm pitch double‑row pin headers to ensure excellent electrical contact, which is convenient for users to place the core board on the marked universal board or breadboard. Users can choose the welding direction according to their actual needs.