MCS-51单片机的C语言U盘文件读写示例程序，适用于89C52或者更大空间的单片机，也适用于ATMEL/PHILIPS/SST等具有1KB内部RAM的单片机(MCS-51 microcontroller C language, U disk file reading and writing sample procedures, applicable to 89C52 or larger space microcontroller, also applies to ATMEL/PHILIPS/S