常见寄存器

Data Registers:                暂存ALU的计算结果

Instruction Registers:         存储当前正在执行的指令

Program Counter:               下一条指令的地址

Address Registers:             存储当前指令所访问数据的地址

Control and Status Registers:  can store both data and addresses, i.e., they are combined Data/Address registers.

Program Status Word:           程序状态。如进位标志、溢出标志、中断状态等