JPS5561855A - Level control system - Google Patents
Level control systemInfo
- Publication number
- JPS5561855A JPS5561855A JP13407078A JP13407078A JPS5561855A JP S5561855 A JPS5561855 A JP S5561855A JP 13407078 A JP13407078 A JP 13407078A JP 13407078 A JP13407078 A JP 13407078A JP S5561855 A JPS5561855 A JP S5561855A
- Authority
- JP
- Japan
- Prior art keywords
- selection
- area
- stack pointer
- level
- accessing
- 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
- Executing Machine-Instructions (AREA)
Abstract
PURPOSE: To enable data reception and giving between different program level easily and in high speed, by providing the level control circuit, in the data processor having a plurality of program running levels.
CONSTITUTION: The level control circuit 17 receives the selection signal from the status information circuit 16 or the level selection instruction, the stack pointer is referenced according to the cause of selection, the register group 14 and the work area stack pointer are respectively shunted in the shunt area and jumped to the address represented in the level selection cause jump area to renew the stack pointer. Further, when accessing is made to the work ares used by the program before the selection by instruction, the stack pointer is returned to the state before the selection with the circuit 17, the shut area is accessed from the content, and accessing is made to the area used by the program before selection from the result of accessing.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13407078A JPS5561855A (en) | 1978-10-31 | 1978-10-31 | Level control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13407078A JPS5561855A (en) | 1978-10-31 | 1978-10-31 | Level control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5561855A true JPS5561855A (en) | 1980-05-09 |
Family
ID=15119667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13407078A Pending JPS5561855A (en) | 1978-10-31 | 1978-10-31 | Level control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5561855A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0283740A (en) * | 1988-09-21 | 1990-03-23 | Matsushita Electric Ind Co Ltd | Operating system |
JPH04245337A (en) * | 1991-01-31 | 1992-09-01 | Nec Ic Microcomput Syst Ltd | Microprocessor |
-
1978
- 1978-10-31 JP JP13407078A patent/JPS5561855A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0283740A (en) * | 1988-09-21 | 1990-03-23 | Matsushita Electric Ind Co Ltd | Operating system |
JPH04245337A (en) * | 1991-01-31 | 1992-09-01 | Nec Ic Microcomput Syst Ltd | Microprocessor |
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