JPS647148A - Processor - Google Patents
ProcessorInfo
- Publication number
- JPS647148A JPS647148A JP16276187A JP16276187A JPS647148A JP S647148 A JPS647148 A JP S647148A JP 16276187 A JP16276187 A JP 16276187A JP 16276187 A JP16276187 A JP 16276187A JP S647148 A JPS647148 A JP S647148A
- Authority
- JP
- Japan
- Prior art keywords
- data
- bus
- instruction
- processor
- controller
- 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
- Bus Control (AREA)
Abstract
PURPOSE:To reduce the number of parts, the number of wirings, and the number of terminals in a microprocessor and to compactly constitute a system by providing a means which temporarily stops an instruction to connect an external instruction bus and an external data bus. CONSTITUTION:A data processor 20 starts an instruction bus controller 31 and fetches an instruction through an instruction bus 22 to execute the instruction. If data is required as the result, data is accessed through a data bus 23. When a data bus access signal is inputted, a timing controller 32 temporarily stops the operation of the data processor 20. An instruction bus controller 31 disconnects an external instruction bus 26 and an internal data bus 28 from each other, and a data bus controller 30 disconnects data busses 27 and 29 from each other, and they are held if an input/output request is issued from the processor 20. Thus, the data bus 23 is accessed through the instruction bus 22.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16276187A JPS647148A (en) | 1987-06-30 | 1987-06-30 | Processor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16276187A JPS647148A (en) | 1987-06-30 | 1987-06-30 | Processor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS647148A true JPS647148A (en) | 1989-01-11 |
Family
ID=15760725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16276187A Pending JPS647148A (en) | 1987-06-30 | 1987-06-30 | Processor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS647148A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100399402C (en) * | 2004-09-14 | 2008-07-02 | 友达光电股份有限公司 | Time sequence controller with external transmission interface and electronic product using said controller |
-
1987
- 1987-06-30 JP JP16276187A patent/JPS647148A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100399402C (en) * | 2004-09-14 | 2008-07-02 | 友达光电股份有限公司 | Time sequence controller with external transmission interface and electronic product using said controller |
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