JPS6446865A - Microprocessor - Google Patents
MicroprocessorInfo
- Publication number
- JPS6446865A JPS6446865A JP62204712A JP20471287A JPS6446865A JP S6446865 A JPS6446865 A JP S6446865A JP 62204712 A JP62204712 A JP 62204712A JP 20471287 A JP20471287 A JP 20471287A JP S6446865 A JPS6446865 A JP S6446865A
- Authority
- JP
- Japan
- Prior art keywords
- wait
- programmable
- microprocessor
- signal
- devices
- 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
- Microcomputers (AREA)
Abstract
PURPOSE:To enable a programmable wait function to apply other I/O devices without adding hardware to other I/O devices, by using a wait display circuit. CONSTITUTION:A microprocessor wait terminal 4 is provided together with an external wait input buffer 2, an OR gate 1 which secures an OR between a programmable wait signal A and an external wait signal, and a transfer gate 3 which outputs the programmable wait signal to outside. A pull-up resistance 5 and an external wait buffer 6 are connected to the terminal 4. A coprocessor contains a coprocessor wait terminal 7 and an input buffer 8. In such a constitution, a wait display circuit outputs a ready signal to the outside of a microprocessor during the bus wait time set by a program. Thus it is possible to apply the programmable wait function of the microprocessor without adding any hardware like a register, etc., to other I/O devices (coprocessors).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62204712A JPS6446865A (en) | 1987-08-17 | 1987-08-17 | Microprocessor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62204712A JPS6446865A (en) | 1987-08-17 | 1987-08-17 | Microprocessor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6446865A true JPS6446865A (en) | 1989-02-21 |
Family
ID=16495059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62204712A Pending JPS6446865A (en) | 1987-08-17 | 1987-08-17 | Microprocessor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6446865A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6419451A (en) * | 1987-07-15 | 1989-01-23 | Hitachi Ltd | Microprocessor |
-
1987
- 1987-08-17 JP JP62204712A patent/JPS6446865A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6419451A (en) * | 1987-07-15 | 1989-01-23 | Hitachi Ltd | Microprocessor |
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