JPS5694451A - Microprocessor incorporating memory - Google Patents

Microprocessor incorporating memory

Info

Publication number
JPS5694451A
JPS5694451A JP17367879A JP17367879A JPS5694451A JP S5694451 A JPS5694451 A JP S5694451A JP 17367879 A JP17367879 A JP 17367879A JP 17367879 A JP17367879 A JP 17367879A JP S5694451 A JPS5694451 A JP S5694451A
Authority
JP
Japan
Prior art keywords
memory
access
address
control signal
bus
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
JP17367879A
Other languages
Japanese (ja)
Inventor
Kenji Kato
Masaki Ogawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17367879A priority Critical patent/JPS5694451A/en
Publication of JPS5694451A publication Critical patent/JPS5694451A/en
Pending legal-status Critical Current

Links

Landscapes

  • Microcomputers (AREA)
  • Executing Machine-Instructions (AREA)

Abstract

PURPOSE: To improve the control speed, by deciding whether address information is given for access to the internal memory or for access to the external memory and by switching automatically the instruction execution time for access to the internal memory and access to the external memory.
CONSTITUTION: External memory 2 is connected to microprocessor 1 through address bus 4, data bus 5, and control signal line 6, and processor 1 is provided with internal memory 3. Further, address deciding circuit part 8 which decides whether address information is given as the address for memory 2 or as the address for memory 3 is connected to bus 4 of processor 1, and control signal generating circuit 9 which generates the control signal of the pulse width different in access to memory 2 and access to memory 3 is connected to circuit 8. Then, the instruction execution time is switched automatically for access to memory 2 and access to memory 3, thereby improving the control speed.
COPYRIGHT: (C)1981,JPO&Japio
JP17367879A 1979-12-27 1979-12-27 Microprocessor incorporating memory Pending JPS5694451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17367879A JPS5694451A (en) 1979-12-27 1979-12-27 Microprocessor incorporating memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17367879A JPS5694451A (en) 1979-12-27 1979-12-27 Microprocessor incorporating memory

Publications (1)

Publication Number Publication Date
JPS5694451A true JPS5694451A (en) 1981-07-30

Family

ID=15965064

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17367879A Pending JPS5694451A (en) 1979-12-27 1979-12-27 Microprocessor incorporating memory

Country Status (1)

Country Link
JP (1) JPS5694451A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161752A (en) * 1983-03-04 1984-09-12 Hitachi Ltd Central processor of data processing system
JPS6145338A (en) * 1984-08-10 1986-03-05 Nec Corp Microcomputer lsi for evaluation
JPS61253559A (en) * 1985-05-02 1986-11-11 Nec Corp Microprocessor
JPS63245547A (en) * 1987-03-31 1988-10-12 Hitachi Ltd Data processor
JPH02183331A (en) * 1989-01-09 1990-07-17 Matsushita Electric Ind Co Ltd Microcomputer
WO1991020037A1 (en) * 1990-06-11 1991-12-26 Oki Electric Industry Co., Ltd. One-chip microcomputer
WO1995027250A1 (en) * 1994-04-05 1995-10-12 Motorola Inc. Protection circuit for a microprocessor
US5809544A (en) * 1995-10-06 1998-09-15 Motorola, Inc. Microcontroller which limits access to internal memory

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148226A (en) * 1974-10-23 1976-04-24 Hitachi Ltd JOHOSHORISOCHISEIGYOKIKO
JPS5235946A (en) * 1975-09-16 1977-03-18 Hitachi Ltd Memory control unit
JPS52100946A (en) * 1976-02-20 1977-08-24 Hitachi Ltd Micro processor
JPS5379446A (en) * 1976-12-24 1978-07-13 Nec Corp External memory control unit
JPS53110438A (en) * 1977-03-09 1978-09-27 Hitachi Ltd Processing method of processing speed selection type
JPS5444847A (en) * 1977-08-30 1979-04-09 Hewlett Packard Yokogawa Data controlller
JPS5464941A (en) * 1977-11-01 1979-05-25 Fuji Electric Co Ltd Weight generator circuit
JPS5470735A (en) * 1977-11-17 1979-06-06 Toshiba Corp Electronic computer
JPS5663656A (en) * 1979-10-25 1981-05-30 Nec Corp Information processing unit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148226A (en) * 1974-10-23 1976-04-24 Hitachi Ltd JOHOSHORISOCHISEIGYOKIKO
JPS5235946A (en) * 1975-09-16 1977-03-18 Hitachi Ltd Memory control unit
JPS52100946A (en) * 1976-02-20 1977-08-24 Hitachi Ltd Micro processor
JPS5379446A (en) * 1976-12-24 1978-07-13 Nec Corp External memory control unit
JPS53110438A (en) * 1977-03-09 1978-09-27 Hitachi Ltd Processing method of processing speed selection type
JPS5444847A (en) * 1977-08-30 1979-04-09 Hewlett Packard Yokogawa Data controlller
JPS5464941A (en) * 1977-11-01 1979-05-25 Fuji Electric Co Ltd Weight generator circuit
JPS5470735A (en) * 1977-11-17 1979-06-06 Toshiba Corp Electronic computer
JPS5663656A (en) * 1979-10-25 1981-05-30 Nec Corp Information processing unit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161752A (en) * 1983-03-04 1984-09-12 Hitachi Ltd Central processor of data processing system
JPH0547855B2 (en) * 1983-03-04 1993-07-19 Hitachi Ltd
JPS6145338A (en) * 1984-08-10 1986-03-05 Nec Corp Microcomputer lsi for evaluation
JPS61253559A (en) * 1985-05-02 1986-11-11 Nec Corp Microprocessor
JPS63245547A (en) * 1987-03-31 1988-10-12 Hitachi Ltd Data processor
JPH02183331A (en) * 1989-01-09 1990-07-17 Matsushita Electric Ind Co Ltd Microcomputer
WO1991020037A1 (en) * 1990-06-11 1991-12-26 Oki Electric Industry Co., Ltd. One-chip microcomputer
WO1995027250A1 (en) * 1994-04-05 1995-10-12 Motorola Inc. Protection circuit for a microprocessor
US5557743A (en) * 1994-04-05 1996-09-17 Motorola, Inc. Protection circuit for a microprocessor
US5809544A (en) * 1995-10-06 1998-09-15 Motorola, Inc. Microcontroller which limits access to internal memory

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