说明：  PIC18指令集中文介绍，详细介绍了microchip刚推出的16位哈拂结构，更大存储空间，RAM分页/段管理的单片机的指令使用
(PIC18 Chinese instruction set, introduced in detail Microchip recently launched 16 Harvard structure, greater storage space, RAM Pagination/SCM management of the use of the directive)