一、MC6801的硬件结构MC6801是第一个用硬件编程的微型计算机芯片(图1),很适合作为微控制器,用来驱动终端显示器。MC6801是 MC6800系列的改进型产品,除了保留了 MC6800的指令系统外,又增加了十条新指命。MC6801除有一个与 MC6800兼容的 CPU 和四个I/O 接口外,还包括一个128字节的 RAM(可作为堆栈和高速暂存存储器用)、一个2048字节的 ROM(用500个字节装终端基本操作,其余字节装软件)、一个16位计数器/定时器和一个程序可控的串行通信接口(可按全双工或半双工格式工作)以 First, MC6801 hardware structure MC6801 is the first micro-computer chip programmed with hardware (Figure 1), it is suitable as a microcontroller, used to drive the terminal display. The MC6801 is an improved version of the MC6800 family that adds ten new commands in addition to the MC6800’s instruction set. In addition to the MC6800-compatible CPU and four I / O interfaces, the MC6801 includes a 128-byte RAM that can be used as a stack and scratchpad, a 2048-byte ROM with 500 bytes The basic operation of the terminal, the remaining bytes of software), a 16-bit counter / timer and a programmable serial communication interface (can be full or half duplex format work) to