设计了一种多功能电话电路，能够防止他人非法串线盗打和窃听电话，通过单片机控制自动存储并显示电话号码和所打电话的时刻及用时，且可通过打印机接口打印以上信息⒚ Designed a multi-functional telephone circuit that can prevent others from illegally burglarizing and tapping the telephone, automatically storing and displaying the telephone number and the time of the telephone call through the single chip microcomputer, and can print the above information through the printer interface