Rakstore CH376S Evaluation Board Development Board Module U Disk SD Card Mouse Support Parallel Port Serial SPI Interface

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The main device U1 in the EV kit is the CH376S chip. Crystal X1 is standard 12MHz, USB host requires higher frequency accuracy than USB device, X1 error requirement is less than 0.4‰, and ordinary 12MHz crystal can basically meet the requirements. Capacitor C4 is used for internal power supply node decoupling to reduce EMI during USB transmission. The capacity is 4700pF to 0.1uF. The normal 103 chip capacitor is 0.01uF. P4 is a USB port, which can be used for USB HOST host mode or USB DEVICE device mode. P5 is an SD card socket that can be used with standard size SD cards. P1 is an 8-bit parallel port signal port for connecting to the parallel port of the MCU. P2 is the signal port of the SPI serial port. It is used to connect to the SPI interface of the microcontroller. P3 is the signal port of the asynchronous serial port, which is used to connect the asynchronous serial port of the single-chip microcomputer.