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Data changing device for read only memory

阅读:30发布:2024-02-09

专利汇可以提供Data changing device for read only memory专利检索,专利查询,专利分析的服务。并且PURPOSE:To change a part of a program in ROM simply by outputting changed data that substitute for prohibited data to a data bus line when a readout prohibiting device prohibits data readout of ROM. CONSTITUTION:A CPU 1 reads out data stored in designated address through a bus line 4 while designating readout address of an ROM 3 through an address bus line 2. A readout prohibiting device 5 sets a specified address of the ROM 3 that requires change, and at the same time, prohibits data readout of the ROM 3 only when the set address coincides with a readout address by the CPU 1 inputted through the bus line 2. At this time, a changed data outputting device 6 outputs the changed data set by a switch in place of the ROM 3. By this way, apparently the same effect with the case where a part of a program of the ROM 3 is changed can be obtained.,下面是Data changing device for read only memory专利的具体信息内容。

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