JPS55166727A - Microcomputer system - Google Patents
Microcomputer systemInfo
- Publication number
- JPS55166727A JPS55166727A JP7351979A JP7351979A JPS55166727A JP S55166727 A JPS55166727 A JP S55166727A JP 7351979 A JP7351979 A JP 7351979A JP 7351979 A JP7351979 A JP 7351979A JP S55166727 A JPS55166727 A JP S55166727A
- Authority
- JP
- Japan
- Prior art keywords
- dma
- signal
- interface circuit
- address
- circuit
- 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 improve the maintenance of and reliability on a system by adding a gate address generating circuit, etc. between a direct memory access(DMA) control circuit and a DMA interface circuit.
CONSTITUTION: With initial load switch 17 ON, DMA address bus 201 is disconnected from DMA interface circuit 4 via tristate gate 11. Similarly, DMA write data line 203 is disconnected from DMA interface circuit 4 for main memory 3. Next, a DMA acknowlege signal is input from DMA control circuit 2 to counter 13 and presettable counter 14 via DMA acknowlege signal line 102 to start the operation of generating a DMA address signal and an address signal for external memory 16. Once the DMA request signal is reset, CPU1 starts executing a program.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7351979A JPS55166727A (en) | 1979-06-13 | 1979-06-13 | Microcomputer system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7351979A JPS55166727A (en) | 1979-06-13 | 1979-06-13 | Microcomputer system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55166727A true JPS55166727A (en) | 1980-12-26 |
Family
ID=13520566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7351979A Pending JPS55166727A (en) | 1979-06-13 | 1979-06-13 | Microcomputer system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55166727A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5972327U (en) * | 1982-11-06 | 1984-05-16 | 三菱電機株式会社 | Electromagnetic coupling device |
-
1979
- 1979-06-13 JP JP7351979A patent/JPS55166727A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5972327U (en) * | 1982-11-06 | 1984-05-16 | 三菱電機株式会社 | Electromagnetic coupling device |
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