目 录引言...............................................................11 设计任务与目的.................................................................................................................................................21.1 设计任务：.........................................................................................................................................................21.2 设计目的：.........................................................................................................................................................22 串口通信原理.......................................................................................................................................................22.1 串行口工作原理.............................................................................................................................................22.3 方案论证............................................................................................................................................................43 硬件设计.......................................................................................................................................................................63.1 AT89S52 最小系统.........................................................................................................................................63.3 LCD 显示电路...................................................................................................................................................73.4 max232 电平转换电路..................................................................................................................................84 软件设计..................................................................................................................................................................94.1 主程序流程图...........................................................................
