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术语 addressing level
释义 addressing level
寻址级;[定址阶[态]]
A determination of the number of steps of indirect addressing which have been applied toa particular program.In zerolevel addressing,the address part of an instruction is the operand (for instance,the addresses of shift instructions). First level is direct addressing,i.e.,the address part of the instruction word has the address of the operand in storage.In second level addressing(indirect), the address partof the instruction word gives the storage location where the address of the operand may be found.
应用于一特定程序的间接寻址的级数。在零级寻址中,一条指令的地址部分即是操作数 (例如移位指令的地址)。一级寻址是直接寻址,即指令的地址部分含有操作数在存储器中的 地址。在二级寻址(间接寻址)中,指令的地址部分给出可以找到操作数地址的存储器的位置 。
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