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本文介绍利用MCS-96单片机的固有特点实现单片机程序保密的几种简单方法,这些保密方法不需要增加任何硬件就可以实现。一、保密字和保密运算MCS-96单片机内部 RAM 空间的顶部16个字节(F0H—FFH)与其它单元略有区别,若脚 V_((?)D)接有掉电备份电源(5V),这16个字节的内容在掉电状态下将不会丢失。利用这一特点,在这16个字节设置保密字,并在单片机应用系统的程序中进行保密运算来
This article describes the use of MCS-96 microcontroller’s inherent characteristics of several single-chip program to ensure the confidentiality of several simple methods, these methods do not need to increase the security of any increase can be achieved. First, the confidential word and secret computing MCS-96 microcontroller RAM space within the top 16 bytes (F0H-FFH) and other units slightly different, if the foot V _ ((?) D) connected to the power supply backup power supply (5V) , The contents of these 16 bytes in the power-down state will not be lost. Use of this feature, set in the 16-byte security word, and in the application of the microcontroller program to carry out security operations