一种51系列单片机的解密方法  

A method for decrypting 51 series microcontroller

作　　者：李会杰[1] 李俊廷 张伟[2] 李严军 LI Huijie LI Junting ZHANG Wei LI Yanjun(School of Meehatronic Engineering, Changchun University of Technology, Changchun 130012, China School of Electrical ＆ Electronic Engineering, Changehun University of Technology, Changchun 130012, China)

机构地区：[1]长春工业大学机电工程学院,吉林长春130012 [2]长春工业大学电气与电子工程学院,吉林长春130012

出　　处：《长春工业大学学报》2017年第4期335-339,共5页Journal of Changchun University of Technology

基　　金：长春市科技计划基金资助项目(13KG09)

摘　　要：通过控制EA的电平,先使单片机执行外部存储器中的程序,在片外存储器中执行跳转指令跳转到超出片内程序存储器地址的执行程序时,将EA改为低电平,用指令读取片内地址范围的目标码。单片机通过串口将目标码发送到上位机,从而实现解码。本解密方法也适用于具有最小模式和微处理器模式的DSP及ARM的解密。By controlling EA level in the 51 series microcontroller, external program is run first. When external ROM jumps to the program as internal ROM address rangeis exceeded, with a jump command, EA level is changed to low. Then the code in internal ROM is read and sent to the host computer through serial port, and the decryption is realized. The method is also applicable to DSP or ARM microprocessor with minimum mode and microprocessor mode.

关 键 词：51系列单片机 数据存储器 程序存储器 解密 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]