GMS81004单片机解密

　　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。
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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)