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PIC18F2431芯片解密

时间:2010-08-11 08:52:56

有关PIC18F2431解密,他的一些基本的特征需要我们去了解。在单片机解密、IC解密过程中,不同的技术手法可能产生的解密解密就不同,而解密手法的选择除了考虑解密者本身的技术经验外,还应该对需解密的单片机有一定的了解。
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以下是我们对PIC18F2431芯片的简单介绍供各位参考:

The STATUS register, shown in Register 5-2, containsthe arithmetic status of the ALU. The STATUS register
can be the operand for any instruction, as with anyother register. If the STATUS register is the destinationfor an instruction that affects the Z, DC, C, OV or N bits,then the write to these five bits is disabled. These bitsare set or cleared according to the device logic. There-fore, the result of an instruction with the STATUSregister as destination may be different than intended.
For example, CLRF STATUS will clear the upper threebits and set the Z bit. This leaves the STATUS registeras 000u u1uu (where u = unchanged).It is recommended, therefore, that only  BCF,  BSF,
SWAPF,  MOVFF and  MOVWF instructions are used toalter the STATUS register, because these instructions
do not affect the Z, C, DC, OV or N bits in the STATUSregister. For other instructions not affecting any Statusbits, see Table 23-2. Note: The C and DC bits operate as a borrowand digit borrow bit respectively, insubtraction.


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