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Microprocessor

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专利汇可以提供Microprocessor专利检索,专利查询,专利分析的服务。并且PURPOSE: To cope with an error of a microcode in a ROM by connecting a RAM to a microcode transfer bus, in a microprocessor having an internal data bus and the microcode transfer bus.
CONSTITUTION: An output (microcode) of a micro-RAM is outputted to a micro- ROM data bus RDB, and a micro-RAM having the same bit length as the microcode and registers of plural sages inputs data being on an internal data bus DB, and outputs the data to the data bus RDB. An instruction is inputted from an external input terminal of a microprocessor from the outside, and when its instruction is executed, the micro-ROM is brought to access, and the microcode is outputted to the bus RDB. If an error exists in its code, the processor causes a mulfunction, but when the error is detected, a correct microcode group corresponding to a group of the microcode containing the error is sent to the bus DB from the external input terminal, and it is inputted to the RAM. In this way, a correct microcode is obtained from the RAM.
COPYRIGHT: (C)1985,JPO&Japio,下面是Microprocessor专利的具体信息内容。

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