说明：  ARM定址方式 直接由暂存器取出值操作 指令中的位址为暂存器编号 例题: MOV R1,R2 R2 -> R1 SUB R0,R1,R2 R1 - R2 -> R0
(ARM addressing directly removed from the register value of the operation command in the address for the register number Example: MOV R1, R2 R2-> R1 SUB R0, R1, R2 R1- R2-> R0)