程序说明：本程序为读写器程序。 下面将本程序所用变量及含义定义如下： 定义SBUF（N）为串行通讯的缓冲区 定义CBUF（N）为读卡卡号的缓冲区-Procedure Descr iption: This procedure for reading and writing program. Following this procedure will be used and the meaning of variables are defined as follows: the defi