说明：  STC89C51数据手册,宏晶科技推出的新一代高速/低功耗/超强抗干扰的单片机，指令代码完全兼容传统8051单片机，12时钟/机器周期和6时钟/机器周期可以任意选择。
(STC89C51 data book,Acer Technology launched a new generation of high speed / low power / super anti-interference microcontroller, instruction code is fully compatible with the traditional 8051 microcontroller, 12 clock / machine cycle and 6 clock / machine cycle can be arbitrarily selected.)