blocks|key|2472050|text|不同之处在于，程序计数器指向要获取/执行的下一条指令，而内存地址寄存器指向正在运行的程序将获取某些数据(而不是指令)的内存位置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2472051|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The difference is that the program counter points to the next instruction to be fetched / executed , whereas the memory address register points to a memory location where the program being run will fetch some data (not an instruction).

blocks|key|1856134|text|PC:程序计数器(PC)保存要执行或解码的下一条指令的地址。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856135|IR:指令寄存器(IR)保存当前正在执行或解码的指令。|1856136|MAR:内存地址寄存器(MAR)保存当前正在执行的指令所需的内存中包含数据的位置的地址。简单地说，MAR指向包含所需数据的内存位置。|1856137|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

PC: program counter(PC) holds the address of the next instruction ,which is to be executed or decoded.

IR: instruction register(IR) holds the instruction which is currently being executed or decoded.

MAR: memory address register (MAR) holds the address of the location in memory, which contains data, that is required by the current instruction being executed.
simply MAR points to the memory location that contains data required.

blocks|key|1856151|text|程序计数器(PC)存储在当前指令执行后将从存储器中取出的下一条指令的地址。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1856152|此地址从PC加载到地址寄存器(AR)中：AR<--PC|offset|length|style|CODE|1856153|由地址寄存器(AR)给出的来自存储器位置的指令被加载到指令寄存器(IR)中：IR<--M[AR]|1856154|程序计数器递增到下一条指令的地址：PC<--PC%2B1|1856155|entityMap^0|0|K|7|0|12|A|0|H|9|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|M|$]]

Program counter (PC) stores the address of next instruction to be fetched from memory after the execution of current instruction.

This address from PC is loaded into the address register (AR): <code>AR&lt;--PC</code>

The instruction from memory location given by address register (AR) is loaded into the instruction register (IR): <code>IR&lt;--M[AR]</code>

The program counter is incremented to the address of next instruction: <code>PC&lt;--PC+1</code>

blocks|key|1852499|text|内存地址寄存器(MAR)保存将从中提取数据以引入CPU的寄存器组件的地址位置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1852500|程序计数器(PC)保存下一条指令的位置(存储在内存中的所有内容都有一个地址)。希望这能有所帮助|1852501|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The Memory Address Register (MAR) holds the address location where data will be fetched from to bring into the register component of a CPU.

the Program Counter (PC) is holds the location of the NEXT instruction (everything stored in memory has an address). hope this helped

blocks|key|2472029|text|程序计数器(PC)是CPU正在执行的当前指令的地址。内存地址寄存器(MAR)可以包含由加载或存储指令访问的数据的地址。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2472030|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Program Counter (PC) is the address of the current instruction being executed by a CPU. Memory Address Register (MAR) could contain address of data being accessed by a load or store instruction.

blocks|key|5999985|text|程序计数器程序计数器保存要获取-解码-执行的下一条指令的地址。这将随着当前指令的解码而自动递增|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5999986|内存地址寄存器(MAR)保存正在执行的当前指令的地址。它指向内存中所需指令所在的相关位置(在此阶段，地址只是从程序计数器复制而来)。|5999987|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

program counter
The program counter holds the address of the next instruction that is to be fetched-decoded-executed. This will increment automatically as the current instruction is being decoded

The Memory Address Register (MAR) holds the address of the current instruction being executed. It points to the relevant location in memory where the required instruction is (at this stage the address is simply copied from the Program Counter).

blocks|key|4583179|text|程序计数器使用逻辑地址(由程序生成的虚拟地址)，而地址寄存器使用物理地址(实际的实际内存地址)。这是主要的区别。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4583180|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The program counter uses logical address (virtual addresses generated by the program), where as the address register uses physical addresses (actual real memory address). This is the main difference.

blocks|key|4583299|text|我在一本书里读到的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4583300|PC只保存指令的地址|4583301|PC在将指令地址传递到MAR后立即添加一个数字|4583302|MAR在寻址周期内保存指令的地址|4583303|在后续提取周期中保存数据的地址|4583304|这些是不同之处的一部分(可能还有其他不同之处)|4583305|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

I read about it in a book
The PC only holds the address of the instruction
PC adds a number immediately after passing the instruction address to MAR
MAR holds the address of the instruction during the addressing cycle
The address to hold the data during subsequent fetch cycles
These are part of the difference(maybe have some other difference)

How memory address register(MAR) and program counter(PC) are different from each other?

difference between memory address register(MAR) and program counter(PC)?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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内存地址寄存器(MAR)和程序计数器(PC)有何不同？

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