Hitachi, Ltd.

Dan Aoki

Yoshinori Ishikawa

Yukinobu Tada

Masato Soma

In a control apparatus for operating with program data, it is possible to alter the operation of a control circuit by rewriting the data of the program memory built in an LSI, with ease and at a low cost independently of the operation of the control circuit. For that purpose, the control apparatus includes a ROM, a SRAM, a means for writing data in the SRAM, a selection means for selecting the output from the ROM or the SRAM in accordance with the addresses supplied to the ROM and the SRAM, and a control means for outputting the addresses to the ROM and the SRAM and operating with the output from the selection means as program data.

Control apparatus for selectively operating with program data from two memories and having a system controller supplying program data and address for writing the data to the second memory

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Higashimurayama, Japan

Dan Aoki