发明授权
- 专利标题: Microcomputer having a program correction function
- 专利标题(中): 具有程序校正功能的微机
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申请号: US40562申请日: 1993-03-31
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公开(公告)号: US5357627A公开(公告)日: 1994-10-18
- 发明人: Azuma Miyazawa , Toshiaki Ishimaru
- 申请人: Azuma Miyazawa , Toshiaki Ishimaru
- 申请人地址: JPX Tokyo
- 专利权人: Olympus Optical Co., Ltd.
- 当前专利权人: Olympus Optical Co., Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX1-76047 19890328; JPX1-131861 19890525; JPX1-325876 19891218
- 主分类号: G06F9/445
- IPC分类号: G06F9/445 ; G06F11/00
摘要:
A microcomputer includes a program memory for storing program data, a program counter for addressing the program memory, an instruction decoder for decoding the program data read out from an address of the program memory addressed by the program counter, an electrically programmable nonvolatile memory for storing address data denoting an address of the program memory where program data to be corrected is stored, and correction program data, a comparator for comparing the output from the program counter with the address data stored in the nonvolatile memory and outputting a coincidence signal when a coincidence is found therebetween, and a program correction circuit for reading out the program data from the nonvolatile memory in response to the coincidence signal, and for supplying the readout data to the instruction decoder in place of the output from the program memory.According to another feature, the microcomputer may comprise a program correction circuit wherein a correction address is supplied to a program counter, and wherein code sections are stored.
公开/授权文献
- US4250533A Security system 公开/授权日:1981-02-10