JPS54109739A - Free address decision method for microprocessor - Google Patents
Free address decision method for microprocessorInfo
- Publication number
- JPS54109739A JPS54109739A JP1651278A JP1651278A JPS54109739A JP S54109739 A JPS54109739 A JP S54109739A JP 1651278 A JP1651278 A JP 1651278A JP 1651278 A JP1651278 A JP 1651278A JP S54109739 A JPS54109739 A JP S54109739A
- Authority
- JP
- Japan
- Prior art keywords
- program
- address
- converter
- alteration
- rom2
- 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 ensure a facilitated alteration of the program with no hardware change of the program counter via the converting function for the program alteration between the additional logic part and the address converter connected onto the data address bus.
CONSTITUTION: Microprocessor 1 is provided to perform the execution and decoding of the order, along with memory device ROM2 which contains program part 6 to carry out the control for the subject to be controlled plus additional and alteration program part 7. Furthermore, address converter 3 is provided to supply the input information of the memory address bus and then to deliver the corresponding address information plus the switch signal of address selector 4. Thus, the address information of ROM2 is selected via selector 4 when no output 5 exists in converter 3 to execute the program of part 6. And when the data on bus 8 is in agreement with the output conditions deciding the output conditions of converter 3, the output information of converter 3 is selected at ROM2. Thus, the additional and alteration orders of part 7 are taken into processor 1.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1651278A JPS54109739A (en) | 1978-02-17 | 1978-02-17 | Free address decision method for microprocessor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1651278A JPS54109739A (en) | 1978-02-17 | 1978-02-17 | Free address decision method for microprocessor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54109739A true JPS54109739A (en) | 1979-08-28 |
Family
ID=11918315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1651278A Pending JPS54109739A (en) | 1978-02-17 | 1978-02-17 | Free address decision method for microprocessor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54109739A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62106399U (en) * | 1985-12-20 | 1987-07-07 |
-
1978
- 1978-02-17 JP JP1651278A patent/JPS54109739A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62106399U (en) * | 1985-12-20 | 1987-07-07 |
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