1、设计目的：

利用MCS-51单片机及相关芯片构成简易收银机。

2、设计要求：

系统实现如下功能：

⑴ 具有可扩展键盘用以实现数字和“＋”、“×”、“＝”的输入。

⑵ 可循环实现单个用户消费总金额的计算。

⑶ 具有复位、单步返回和小数点显示等扩展的功能。

-1, is designed to:

　　　　The use of MCS-51 microcontroller and related chips constitute a simple cash register.

　　2, design requirements:

　　　　System to achieve the following functions:

　　 ⑴ with a scalable digital and "+","×","=" keyboard for input.

　　 ⑵ can be recycled to achieve a single user consumption, the total amount of calculations.

　　 ⑶ a reset, single-step returns and displays the decimal expansion of functions.