JPS54146552A - Interruption control system - Google Patents
Interruption control systemInfo
- Publication number
- JPS54146552A JPS54146552A JP5513678A JP5513678A JPS54146552A JP S54146552 A JPS54146552 A JP S54146552A JP 5513678 A JP5513678 A JP 5513678A JP 5513678 A JP5513678 A JP 5513678A JP S54146552 A JPS54146552 A JP S54146552A
- Authority
- JP
- Japan
- Prior art keywords
- priority
- register
- interruption
- circuit
- 1aw1n
- 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 ensure process of the interruption request in the proper state by providing the priority register and the register alteration circuit which alters the value of the priority register and then making the priority identical among all external units connected to the processor or changing the priority respectively.
CONSTITUTION: The interruption request signals given from plural external units which operate nonsynchronously are received, and the interruption request of the highest priority is accepted to send the interruption acceptance signal to the processor main body as well as to the external unit which delivers the interruption signal. In such control system, priority register 6 is provided to hold the value to decide the interruption priority for external units 1aW1n, along with register conversion circuit 7 which alters the contents of register 6. Thus, the interruption priority is decided by alteration circuit 7 to change the priority of register 6 when interruption acceptance circuit 3 accepts the interruptions of units 1aW1n or in case the contents of register 6 is altered by the command given from processor main body 2.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5513678A JPS54146552A (en) | 1978-05-09 | 1978-05-09 | Interruption control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5513678A JPS54146552A (en) | 1978-05-09 | 1978-05-09 | Interruption control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54146552A true JPS54146552A (en) | 1979-11-15 |
Family
ID=12990358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5513678A Pending JPS54146552A (en) | 1978-05-09 | 1978-05-09 | Interruption control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54146552A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56129473A (en) * | 1980-03-17 | 1981-10-09 | Ricoh Co Ltd | Facsimile device with memory device |
JPS576925A (en) * | 1980-06-16 | 1982-01-13 | Hitachi Ltd | Priority selecting circuit |
JPH01270161A (en) * | 1988-04-22 | 1989-10-27 | Hitachi Ltd | Common bus control system |
JPH01279354A (en) * | 1988-04-28 | 1989-11-09 | Internatl Business Mach Corp <Ibm> | Data processing system having common bus and preference decision circuit |
JPH02146658A (en) * | 1988-11-29 | 1990-06-05 | Nec Corp | Priority processing system |
-
1978
- 1978-05-09 JP JP5513678A patent/JPS54146552A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56129473A (en) * | 1980-03-17 | 1981-10-09 | Ricoh Co Ltd | Facsimile device with memory device |
JPH0335865B2 (en) * | 1980-03-17 | 1991-05-29 | Ricoh Kk | |
JPS576925A (en) * | 1980-06-16 | 1982-01-13 | Hitachi Ltd | Priority selecting circuit |
JPH01270161A (en) * | 1988-04-22 | 1989-10-27 | Hitachi Ltd | Common bus control system |
JPH01279354A (en) * | 1988-04-28 | 1989-11-09 | Internatl Business Mach Corp <Ibm> | Data processing system having common bus and preference decision circuit |
JPH02146658A (en) * | 1988-11-29 | 1990-06-05 | Nec Corp | Priority processing system |
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