JPS6459442A - Start signal output system in microprocessor - Google Patents
Start signal output system in microprocessorInfo
- Publication number
- JPS6459442A JPS6459442A JP62216657A JP21665787A JPS6459442A JP S6459442 A JPS6459442 A JP S6459442A JP 62216657 A JP62216657 A JP 62216657A JP 21665787 A JP21665787 A JP 21665787A JP S6459442 A JPS6459442 A JP S6459442A
- Authority
- JP
- Japan
- Prior art keywords
- external device
- start signal
- busy
- signal
- outputted
- 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 prevent a start signal from being outputted in a busy state by generating a start signal output request to generate the start signal in a microprocessor independently of the state of an external device and controlling the output of this start signal to the external device in accordance with a busy signal by a gate circuit. CONSTITUTION:When it is necessary to output the start signal to the external device, a flip flop 21 is set unconditionally without checking the busy status of the external device. The Q output signal of the flip flop 21 is not outputted as a start signal START to the external device as it is but is outputted to the external device in accordance with a busy signal BUSY by the output control of an AND gate 23. Thus, the start signal START is prevented from being outputted to the external device when the external device is in the busy state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62216657A JPS6459442A (en) | 1987-08-31 | 1987-08-31 | Start signal output system in microprocessor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62216657A JPS6459442A (en) | 1987-08-31 | 1987-08-31 | Start signal output system in microprocessor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6459442A true JPS6459442A (en) | 1989-03-07 |
Family
ID=16691890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62216657A Pending JPS6459442A (en) | 1987-08-31 | 1987-08-31 | Start signal output system in microprocessor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6459442A (en) |
-
1987
- 1987-08-31 JP JP62216657A patent/JPS6459442A/en active Pending
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