标签: p89c51

P89c51rc81.前言................................................................................................................................................22.特色简介........................................................................................................................................23.内部功能和芯片封装....................................................................................................................23.1内部功能方块图....................................................................................................................23.2特殊功能寄存器SFR一览表.........................................................................................43.3片脚功能图和芯片封装片脚图.....................................……