这里我们提供对GMS81004单片机的基本性能特征介绍，因为在GMS81004解密等IC解密、单片机解密过程中，对单片机本身内部结构特征及加密性能有一定的了解，能够帮助客户更好的理解单片机解密技术，帮助解密工程师进行加解密特性分析以选择最合理的解密方案。
　　有GMS81004解密等单片机解密需求者请与芯谷芯片解密研究所联系咨询更多解密详情
　　芯片解密咨询电话：0755-82815425，82816682　

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　　关于GMS81004部分特征介绍：
　　A register
　　- 8bit Accumulator.
　　- In the case of 16-bit operation, compose the lower 8-bit of A, upper 8bit in Y (16-bit Accumulator)
　　- In the case of multiplication instruction, execute as a multiplier register. After multiplication operation, the lower 8-bit of the result enters. (Y*A ?? YA)
　　- In the case of division instruction, execute as the lower 8-bit of dividend. After division operation, quotient enters.
　　X register
　　- General-purpose 8-bit register
　　- In the case of index addressing mode within direct page(RAM area), execute as index register.
　　- In the case of division instruction, execute as register.
　　Y register
　　- General-purpose 8-bit register
　　- In the case of index addressing mode, execute as index register
　　- In the case of 16-bit operation instruction, execute as the upper 8-bit of YA (16-bit accumulator).
　　- In the case of multiplication instruction, execute as a multiplicand register. After multiplication operation, the upper 8-bit of the result enters.
　　- In the case of division instruction, execute as the upper 8-bit of dividend. After division operation, remains enters.
　　- Can be used as loop counter of conditional branch command. (e.g.DBNE Y, rel)

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