JPS54109733A - Synchronous control system for interface device - Google Patents
Synchronous control system for interface deviceInfo
- Publication number
- JPS54109733A JPS54109733A JP1722478A JP1722478A JPS54109733A JP S54109733 A JPS54109733 A JP S54109733A JP 1722478 A JP1722478 A JP 1722478A JP 1722478 A JP1722478 A JP 1722478A JP S54109733 A JPS54109733 A JP S54109733A
- Authority
- JP
- Japan
- Prior art keywords
- cpu1
- port
- signal
- cpu
- given
- 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
- Information Transfer Systems (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE: To decrease the number of the line for the timing signal and thus to facilitate the circuit design by synchronizing the interface device with CPU only when the information is transferred between CPU and the peripheral units with the nonsynchronous transfer given usually with CPU.
CONSTITUTION: I/O port 2 is provided between CPU1 and the peripheral unit such as key input part 3 or the like to interface the order indicating the transfer of the information given from CPU1 and part 3. In such port 2, CPU1 and port 2 are connected via data bus 4 and address bus 5, and port 2 and part 3 are connected via data bus 6 and 7. Furthermore, control signal J is transmitted to port 2 from CPU1 via signal line 8, and the order code of signal J is decoded at port 2. And the synchronous pulse is generated based on signal J in case the information transmission order is given from CPU1. With this synchronous pulse, the synchronization is secured with CPU1 but not secured usually.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1722478A JPS54109733A (en) | 1978-02-16 | 1978-02-16 | Synchronous control system for interface device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1722478A JPS54109733A (en) | 1978-02-16 | 1978-02-16 | Synchronous control system for interface device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54109733A true JPS54109733A (en) | 1979-08-28 |
Family
ID=11937971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1722478A Pending JPS54109733A (en) | 1978-02-16 | 1978-02-16 | Synchronous control system for interface device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54109733A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6285360A (en) * | 1985-10-09 | 1987-04-18 | Mitsubishi Electric Corp | Serial data input/output circuit |
-
1978
- 1978-02-16 JP JP1722478A patent/JPS54109733A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6285360A (en) * | 1985-10-09 | 1987-04-18 | Mitsubishi Electric Corp | Serial data input/output circuit |
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