通过以STC15系列单片机为主控芯片，设计外围电路，通过在Keil4软件下编程，在硬件电路上模拟实现ATM机进行密码校验，存取款等操作-Through the STC15 series microcontroller as the main control chip, the design of the peripheral circuit, through the Keil4 software programming in the hardware circuit to simulate th