JPS55108052A - Data processing system - Google Patents

Data processing system

Info

Publication number
JPS55108052A
JPS55108052A JP1412079A JP1412079A JPS55108052A JP S55108052 A JPS55108052 A JP S55108052A JP 1412079 A JP1412079 A JP 1412079A JP 1412079 A JP1412079 A JP 1412079A JP S55108052 A JPS55108052 A JP S55108052A
Authority
JP
Japan
Prior art keywords
address area
ram
rom1
ram2
register
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.)
Granted
Application number
JP1412079A
Other languages
Japanese (ja)
Other versions
JPS6353573B2 (en
Inventor
Fujio Wajima
Shuhei Yasuda
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.)
Usac Electronic Ind Co Ltd
Original Assignee
Usac Electronic Ind 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 Usac Electronic Ind Co Ltd filed Critical Usac Electronic Ind Co Ltd
Priority to JP1412079A priority Critical patent/JPS55108052A/en
Publication of JPS55108052A publication Critical patent/JPS55108052A/en
Publication of JPS6353573B2 publication Critical patent/JPS6353573B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To enable to use the entire areas of RAM effectively, by accessing the address area of RAM duplicated with ROM and using the address area of RAM hidden with ROM as the set of the register separate from the memory space.
CONSTITUTION: The processor 5 is provided with the microprogram counter 10, and microinstruction register 11, and ROM1 and RAM2 have a part of address area duplicatedly. If specific microlinstruction is set to the register 11 of the unit 3, the address area of RAM2 duplicated with ROM1 is accessed. Thus, the address area of RAM2 hidden with ROM1 is used as the set of separate registers from the memory space to enable to use the entire areas of RAM without waste.
COPYRIGHT: (C)1980,JPO&Japio
JP1412079A 1979-02-09 1979-02-09 Data processing system Granted JPS55108052A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1412079A JPS55108052A (en) 1979-02-09 1979-02-09 Data processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1412079A JPS55108052A (en) 1979-02-09 1979-02-09 Data processing system

Publications (2)

Publication Number Publication Date
JPS55108052A true JPS55108052A (en) 1980-08-19
JPS6353573B2 JPS6353573B2 (en) 1988-10-24

Family

ID=11852253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1412079A Granted JPS55108052A (en) 1979-02-09 1979-02-09 Data processing system

Country Status (1)

Country Link
JP (1) JPS55108052A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58225458A (en) * 1982-06-25 1983-12-27 Nec Corp Single-chip microcomputer
JP2011175445A (en) * 2010-02-24 2011-09-08 Renesas Electronics Corp Semiconductor device and data processing system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5014103A (en) * 1973-06-11 1975-02-14
JPS5092063A (en) * 1973-12-12 1975-07-23
JPS5228823A (en) * 1975-08-29 1977-03-04 Sharp Corp Rom control system
JPS5344134A (en) * 1976-10-04 1978-04-20 Oki Electric Ind Co Ltd Microprogram control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5014103A (en) * 1973-06-11 1975-02-14
JPS5092063A (en) * 1973-12-12 1975-07-23
JPS5228823A (en) * 1975-08-29 1977-03-04 Sharp Corp Rom control system
JPS5344134A (en) * 1976-10-04 1978-04-20 Oki Electric Ind Co Ltd Microprogram control system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58225458A (en) * 1982-06-25 1983-12-27 Nec Corp Single-chip microcomputer
JP2011175445A (en) * 2010-02-24 2011-09-08 Renesas Electronics Corp Semiconductor device and data processing system
US9298657B2 (en) 2010-02-24 2016-03-29 Renesas Electronics Corporation Semiconductor device and data processing system

Also Published As

Publication number Publication date
JPS6353573B2 (en) 1988-10-24

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