说明：  C51的PT2272软件解码程序，网上大部分PT2272的解码程序都是全程占用单片机系统资源，造成巨大的资源浪费。本程序利用单片机定时器中断进行解码，基本上不占用单片机系统资源，不影响单片机同时执行其他任务。经过测试，本程序有较高的可靠性。能轻易移植到其它项目上。
(The PT2272 C51 software decoding process, most online programs are full decoding PT2272 take SCM system resources, causing a huge waste of resources. The program uses the timer interrupt to decode single chip, basically do not take SCM system resources, does not affect the microcontroller to perform other tasks simultaneously. After testing, the program has high reliability. Easily portable to other projects.)