公开(公告)号：US5408672A

公开(公告)日：1995-04-18

申请号：US976400

申请日：1992-11-13

申请人： Hideo Miyazawa ,  Shigeyuki Komatsu ,  Michio Yoshida ,  Toshiaki Suzuki ,  Akito Miyamoto ,  Azuma Miyazawa ,  Toshiaki Ishimaru

发明人： Hideo Miyazawa ,  Shigeyuki Komatsu ,  Michio Yoshida ,  Toshiaki Suzuki ,  Akito Miyamoto ,  Azuma Miyazawa ,  Toshiaki Ishimaru

IPC分类号： G06F9/26 ,  G06F9/445 ,  G06F9/06 ,  G06F12/12 ,  G06F13/40

CPC分类号： G06F8/66 ,  G06F9/268 ,  G06F9/328

摘要： When an error is found in a program of the microcomputer, there are stored in a writable memory change address data of an address of a wrong instruction to be subjected to modification or insertion in the read-only memory, change instruction codes of modification or insertion for replacement of the wrong instruction, and a control code controlling a second program counter. When the contents of the program counter match the change address data stored in the writable memory, the program data in the writable memory is executed in place of the wrong instruction in the read-only memory according to the control code controlling the second program counter. Consequently, even when a bug is found in the program, a program replacement and/or insertion can be easily achieved and it is unnecessary to discard the final product on which the program is developed through a mask. Moreover, the program can be easily changed from an external device. This facilitates determining the cause of troubles occurring in the one-chip microcomputer incorporated in an electronic apparatus and hence improves reliability of the apparatus.

摘要翻译： 当在微计算机的程序中发现错误时，存储在可写存储器中的改变或插入到只读存储器中的错误指令的地址的改变地址数据，改变或插入的改变指令代码 用于替换错误的指令，以及控制代码来控制第二程序计数器。 当程序计数器的内容与存储在可写存储器中的改变地址数据匹配时，根据控制第二程序计数器的控制代码，代替只读存储器中的错误指令执行可写存储器中的程序数据。 因此，即使在程序中发现错误，也可以容易地实现程序更换和/或插入，并且不需要通过掩码丢弃开发程序的最终产品。 此外，程序可以从外部设备轻松更改。 这有助于确定在电子设备中结合的单片微计算机中发生故障的原因，从而提高了设备​​的可靠性。