用单片机读写SD卡，SD卡因具备体积小、功耗低、可擦写以及非易失性等特点而被广泛应用于消费类电子产品中。特别是近年来，随着价格不断下降且存储容量不断提高，它的应用范围日益增广-Microcontroller to read and write SD card, SD Cain with small size, low power consumption, erasable and non-volatile memory is widely used in consumer electronics