这是根据郭天祥单片教程整理的各个寄存器的地址、功能和用法，采用excel表格形式，可以帮助单片机系统开发人员尽快地掌握STC89系列单片机的寄存器(This is the address, function and usage of each register based on Guo Tianxiang's single chip tutorials. The form of Excel can help MCU developers grasp the registers of STC89