说明：  stc全系列的单片机封装库，protel 99se格式，可以转成dxp等其他格式。我一直用这个，最近stc官网下不了，所以我共享出来
(stc full range of single-chip package library, protel 99se format, can be converted into other formats dxp. I have been using this, the official website recently stc can not, so I shared out)