JPS5582362A - Operation processing unit - Google Patents
Operation processing unitInfo
- Publication number
- JPS5582362A JPS5582362A JP15782478A JP15782478A JPS5582362A JP S5582362 A JPS5582362 A JP S5582362A JP 15782478 A JP15782478 A JP 15782478A JP 15782478 A JP15782478 A JP 15782478A JP S5582362 A JPS5582362 A JP S5582362A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- cpu
- ram
- clock
- 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
Links
Landscapes
- Digital Computer Display Output (AREA)
Abstract
PURPOSE: To access freely two-system RAMs at a high speed without special CPU and RAM and restriction on program generation.
CONSTITUTION: An address switch circuit which supplies a ROM and a RAM, where data is stored, to central operation processing circuit CPU alternately according to least significant address signals and clock generation circuit 4 which supplies clock signals to signals, which are supplied to the circuit above to switch the ROM and the RAM, and a CPU are provided. Fundamental clock signal d from an oscillator circuit is inputted to this clock generation circuit 4, and ROM/RAM switching signal c is generated by FF21, and further, least signal significant address signal e of the address signal from CPU is compared with signal c by exclsive OR circuit 23, and OR between the output of circuit 23 and clock signal b is operated by OR circuit 24, and fundamental clock signal d is gated by gate circuit 25 according to the output of circuit 24, and FF22 is operated to output clocks a and b to be supplied to CPU.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15782478A JPS5582362A (en) | 1978-12-18 | 1978-12-18 | Operation processing unit |
DE2922540A DE2922540C2 (en) | 1978-06-02 | 1979-06-01 | Data processing system |
US06/044,379 US4298931A (en) | 1978-06-02 | 1979-06-01 | Character pattern display system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15782478A JPS5582362A (en) | 1978-12-18 | 1978-12-18 | Operation processing unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5582362A true JPS5582362A (en) | 1980-06-21 |
JPS6253834B2 JPS6253834B2 (en) | 1987-11-12 |
Family
ID=15658105
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15782478A Granted JPS5582362A (en) | 1978-06-02 | 1978-12-18 | Operation processing unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5582362A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS588348A (en) * | 1981-07-07 | 1983-01-18 | Sony Corp | Microcomputer |
JPS58208845A (en) * | 1982-05-31 | 1983-12-05 | Toshiba Corp | Overlap display system |
JPS63236083A (en) * | 1987-03-25 | 1988-09-30 | 株式会社東芝 | Image display system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5391533A (en) * | 1977-01-22 | 1978-08-11 | Hitachi Ltd | Time-division control system of refresh memory |
JPS53139275A (en) * | 1977-05-11 | 1978-12-05 | Hitachi Ltd | Dehumidifying device |
-
1978
- 1978-12-18 JP JP15782478A patent/JPS5582362A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5391533A (en) * | 1977-01-22 | 1978-08-11 | Hitachi Ltd | Time-division control system of refresh memory |
JPS53139275A (en) * | 1977-05-11 | 1978-12-05 | Hitachi Ltd | Dehumidifying device |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS588348A (en) * | 1981-07-07 | 1983-01-18 | Sony Corp | Microcomputer |
JPH0377530B2 (en) * | 1981-07-07 | 1991-12-10 | Sony Corp | |
JPS58208845A (en) * | 1982-05-31 | 1983-12-05 | Toshiba Corp | Overlap display system |
JPH0373897B2 (en) * | 1982-05-31 | 1991-11-25 | ||
JPS63236083A (en) * | 1987-03-25 | 1988-09-30 | 株式会社東芝 | Image display system |
Also Published As
Publication number | Publication date |
---|---|
JPS6253834B2 (en) | 1987-11-12 |
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