JPS5694451A - Microprocessor incorporating memory - Google Patents
Microprocessor incorporating memoryInfo
- 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
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
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)
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)
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 |
-
1979
- 1979-12-27 JP JP17367879A patent/JPS5694451A/en active Pending
Patent Citations (9)
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)
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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