基于Atm89c51并用定时器T0方式以及串口通信送入4094，用数码管接于4094输出端，使单片机发送的数据能间接的在数码管上显示0-99；-T0 timer based Atm89c51 and use serial communication mode and into 4094, then in 4094 with digital output, the microcontroller sends the data to indirect control on the digital d