JPS5520534A - Data processor - Google Patents
Data processorInfo
- Publication number
- JPS5520534A JPS5520534A JP9283478A JP9283478A JPS5520534A JP S5520534 A JPS5520534 A JP S5520534A JP 9283478 A JP9283478 A JP 9283478A JP 9283478 A JP9283478 A JP 9283478A JP S5520534 A JPS5520534 A JP S5520534A
- Authority
- JP
- Japan
- Prior art keywords
- order
- subroutine
- return
- condition
- register
- 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 increase the processing speed by carrying out simultaneously both the order to execute the return from the subroutine and the condition branching order executed outside the subroutine at the microprogram control type data processor.
CONSTITUTION: The microprograms read out from microprogram memory 1 and 2 are selected at microorder selection circuit 3 which is controlled by switch circuit 5 and then stored in order read-out register 4 for execution of the order. When the condition branching order is executed, order condition decision circuit 6 is actuated to control circuit 5 for selection of the next order. For the return from the subroutine, the address of the return address register 7 which is previously stored is used. Furthermore, the conditional branching is carried out through register 7 and based on the order to give simultaneous execution to both the return order from the subroutine and the condition branching order in order to enable the return from the subroutine.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9283478A JPS5520534A (en) | 1978-07-28 | 1978-07-28 | Data processor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9283478A JPS5520534A (en) | 1978-07-28 | 1978-07-28 | Data processor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5520534A true JPS5520534A (en) | 1980-02-14 |
Family
ID=14065449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9283478A Pending JPS5520534A (en) | 1978-07-28 | 1978-07-28 | Data processor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5520534A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5856153A (en) * | 1981-09-30 | 1983-04-02 | Fujitsu Ltd | Subroutine return system |
JPS62145326A (en) * | 1985-12-20 | 1987-06-29 | Toshiba Corp | Microprogram control circuit |
JPH01171029A (en) * | 1987-12-25 | 1989-07-06 | Nec Corp | Microprogram controller |
JPH0267632A (en) * | 1988-09-01 | 1990-03-07 | Hitachi Ltd | Method for constituting branch instruction in electronic computer |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5161749A (en) * | 1974-11-26 | 1976-05-28 | Fujitsu Ltd | Deetashorisochino shoriringuseigyohoshiki |
JPS51147143A (en) * | 1975-06-13 | 1976-12-17 | Hitachi Ltd | Micro program control mechanism |
-
1978
- 1978-07-28 JP JP9283478A patent/JPS5520534A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5161749A (en) * | 1974-11-26 | 1976-05-28 | Fujitsu Ltd | Deetashorisochino shoriringuseigyohoshiki |
JPS51147143A (en) * | 1975-06-13 | 1976-12-17 | Hitachi Ltd | Micro program control mechanism |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5856153A (en) * | 1981-09-30 | 1983-04-02 | Fujitsu Ltd | Subroutine return system |
JPS62145326A (en) * | 1985-12-20 | 1987-06-29 | Toshiba Corp | Microprogram control circuit |
JPH01171029A (en) * | 1987-12-25 | 1989-07-06 | Nec Corp | Microprogram controller |
JPH0267632A (en) * | 1988-09-01 | 1990-03-07 | Hitachi Ltd | Method for constituting branch instruction in electronic computer |
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