说明：  sTC系列单片机内部AD的应用 STC89LE52AD、54AD、58AD、516AD这几款89系列的STC单片机内部自带有8路8位的AD转换器，分布在P1口的8位上，当时钟在40MHz以下时，每17个机器周期可完成一次AD转换。
(STC series single-chip internal AD Application STC89LE52AD, 54AD, 58AD, 516AD that several 89 series of STC has its own single-chip 8-way internal 8-bit AD converter, the distribution of P1 at the mouth of 8 on, when the bell At 40MHz below, every 17 machine cycles to be completed by an AD converter.)