A high reliable microcontroller AT89C52 is used as the core control chip in the ATM system, in which FM24C02 chip with I2C bus interface is adopted to complete the storage of the cipher code and amount of money, and LCD128x64 is used to prompt the program’s running state and operating procedures. The system is convenient to modify or add/subtract function by using C51 language program,which is more transplantable and reliable. The simulation process of ATM was successfully realized by Proteus software. The simulation result shows that the SCM program debugging on the target hardware can be greatly simplified by using Proteus software.%自动取款机系统采用高可靠性的AT89C52单片机作为核心控制芯片，采用具备I2C总线接口的FM24C02芯片完成密码与金额的存储，通过液晶显示器128×64显示运行状态和操作步骤。软件设计采用具有较好移植性和可读性的C51语言编写程序，以便修改和增减功能。通过Proteus软件成功实现了自动取款机的仿真过程。经仿真表明，利用Proteus软件进行仿真设计可极大地简化单片机程序在目标硬件上的调试工作。
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