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热词
    • 1. 发明授权
    • Apparatus and method for correcting microcomputer software errors
    • 微机软件错误校正的装置及方法
    • US4905200A
    • 1990-02-27
    • US237468
    • 1988-08-29
    • Richard A. PidsosnyMichael J. BurkeMark W. Jarvis
    • Richard A. PidsosnyMichael J. BurkeMark W. Jarvis
    • G06F9/26G06F9/445G06F12/06
    • G06F12/0638G06F8/66G06F9/328
    • An apparatus for replacing an undesired code stored in a plurality of storage locations in read-only memory (ROM) with a replacement code. The replacement code, including a jump-back instruction to readdress the ROM, are programmed into an EEPROM. First and second storage locations store the beginning address of the undesired code and the beginning address of the replacement code, respectively. When the beginning address of the undesired code is generated by a program counter, a comparator generates a transfer signal. In response, the beginning address of the replacement code stored in the second storage location is transferred into the program counter. Each address of the replacement code is then sequenced by the program counter until a central processing unit recognizes the jump-back instruction. The central processing unit then readdresses the ROM in response to the jump-back instruction after the entire replacement code has been executed in place of the undesired code.
    • 一种用替换代码替换存储在只读存储器(ROM)中的多个存储位置中的不期望代码的装置。 包括用于对ROM进行读取的跳转指令的替换代码被编程到EEPROM中。 第一和第二存储单元分别存储不需要代码的起始地址和替换代码的起始地址。 当不期望的代码的起始地址由程序计数器产生时,比较器产生传送信号。 作为响应,存储在第二存储位置中的替换代码的开始地址被传送到程序计数器。 然后由程序计数器对替换代码的每个地址进行排序,直到中央处理单元识别跳转指令为止。 然后,中央处理单元在执行整个替换代码之后,响应于跳回指令来代替ROM来代替不想要的代码。