JPS5627453A - Address control system - Google Patents
Address control systemInfo
- Publication number
- JPS5627453A JPS5627453A JP10191679A JP10191679A JPS5627453A JP S5627453 A JPS5627453 A JP S5627453A JP 10191679 A JP10191679 A JP 10191679A JP 10191679 A JP10191679 A JP 10191679A JP S5627453 A JPS5627453 A JP S5627453A
- Authority
- JP
- Japan
- Prior art keywords
- contents
- program
- instruction
- address
- branch
- 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
Abstract
PURPOSE: To decrease the number of program steps by providing programmable logic array PLA that receives conditional flag contents and contents corresponding to program steps.
CONSTITUTION: Instruction decoder 4 sends program branch instruction JUM to PLA output part 11. Then, PLA8 receives respective bit contents of flag register 9 and step register 10 and generates the address of a program branch destination, determined in accordance with the combinational state of conditional flag contents, through logic constitution. Output part 11 performs OR in terms of respective output line signals of PLA8 and outputs the OR output as the address contents of the branch destination by instruction JUM. This output signal is supplied to address register 2 by way of multiplexer 7, completing branch processing. Therefore, the processing is performed by the single branch instruction and the number of program steps is decreased, which is useful for a microcomputer whose program size is limited.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10191679A JPS5627453A (en) | 1979-08-09 | 1979-08-09 | Address control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10191679A JPS5627453A (en) | 1979-08-09 | 1979-08-09 | Address control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5627453A true JPS5627453A (en) | 1981-03-17 |
Family
ID=14313225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10191679A Pending JPS5627453A (en) | 1979-08-09 | 1979-08-09 | Address control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5627453A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01224836A (en) * | 1988-03-04 | 1989-09-07 | Nippon Hoso Kyokai <Nhk> | Processor controller |
-
1979
- 1979-08-09 JP JP10191679A patent/JPS5627453A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01224836A (en) * | 1988-03-04 | 1989-09-07 | Nippon Hoso Kyokai <Nhk> | Processor controller |
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