JPS6467626A - Address modifying circuit - Google Patents

Address modifying circuit

Info

Publication number
JPS6467626A
JPS6467626A JP22587887A JP22587887A JPS6467626A JP S6467626 A JPS6467626 A JP S6467626A JP 22587887 A JP22587887 A JP 22587887A JP 22587887 A JP22587887 A JP 22587887A JP S6467626 A JPS6467626 A JP S6467626A
Authority
JP
Japan
Prior art keywords
data
constant
register
index register
rom
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP22587887A
Other languages
Japanese (ja)
Inventor
Kenichi Kobayashi
Yoji Tachibana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC IC Microcomputer Systems Co Ltd
Original Assignee
NEC IC Microcomputer Systems Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC IC Microcomputer Systems Co Ltd filed Critical NEC IC Microcomputer Systems Co Ltd
Priority to JP22587887A priority Critical patent/JPS6467626A/en
Publication of JPS6467626A publication Critical patent/JPS6467626A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To reduce the chip area for a control circuit of a 1-chip microcomputer by using a rewritable index register and a computing element which applies the arithmetic operations to the data on the address part in a microinstruction as well as to the contents of the index register. CONSTITUTION:A computing element applies the arithmetic operations to the contents of an index register 2 as well as to the data on the address part of a microinstruction fetched by an instruction register 7. The result obtained by the element 4 is used as an effective address. Thus it is possible to handle each constant, i.e., a data group via a common program even though these constant and group are contained in a ROM 6 just by rewriting only the data on the register 2 in case the change is desired only for the constant which is used for the processing in a program via the common program. As a result, the capacity of a ROM 6 is reduced together with reduction of a chip area.
JP22587887A 1987-09-08 1987-09-08 Address modifying circuit Pending JPS6467626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22587887A JPS6467626A (en) 1987-09-08 1987-09-08 Address modifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22587887A JPS6467626A (en) 1987-09-08 1987-09-08 Address modifying circuit

Publications (1)

Publication Number Publication Date
JPS6467626A true JPS6467626A (en) 1989-03-14

Family

ID=16836279

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22587887A Pending JPS6467626A (en) 1987-09-08 1987-09-08 Address modifying circuit

Country Status (1)

Country Link
JP (1) JPS6467626A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5360529A (en) * 1976-11-12 1978-05-31 Hitachi Ltd Data processor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5360529A (en) * 1976-11-12 1978-05-31 Hitachi Ltd Data processor

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