JPS6458004A - Control circuit - Google Patents
Control circuitInfo
- Publication number
- JPS6458004A JPS6458004A JP62215924A JP21592487A JPS6458004A JP S6458004 A JPS6458004 A JP S6458004A JP 62215924 A JP62215924 A JP 62215924A JP 21592487 A JP21592487 A JP 21592487A JP S6458004 A JPS6458004 A JP S6458004A
- Authority
- JP
- Japan
- Prior art keywords
- level
- turned
- power supply
- pout
- port
- 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 prevent the runaway of a device by stopping the working of a power supply circuit after a prescribed processing action when a power supply switch is turned off. CONSTITUTION:An output port Pout is set at 'Hi' level when it is known that a power supply switch SW1 is turned on after detecting that an input port Pin is set at 'Lo' level. Thus the transistors TR2 and TR3 are turned on with the base side of a TR4 kept at 'Hi' level. Then the voltage is continuously impressed to a power supply circuit 2 from a battery 3 via the TR4. When the switch SW1 is opened, the base side of a TR1 is set at 'Lo' level with the port Pin of a control part 1 set at 'Hi' level respectively. The part 1 knows that the SW1 is turned off when the port Pin is set at 'Hi' level and carries out the prescribed processing to set the port Pout at 'Lo' level. When the Pout is set at 'Lo' level, the TR2-TR4 are turned off and no voltage is impressed to the circuit 2 from the battery 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62215924A JPS6458004A (en) | 1987-08-28 | 1987-08-28 | Control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62215924A JPS6458004A (en) | 1987-08-28 | 1987-08-28 | Control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6458004A true JPS6458004A (en) | 1989-03-06 |
Family
ID=16680517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62215924A Pending JPS6458004A (en) | 1987-08-28 | 1987-08-28 | Control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6458004A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57125423A (en) * | 1981-01-28 | 1982-08-04 | Jeco Co Ltd | Power supply device for battery driven microcomputer |
JPS60108923A (en) * | 1983-11-18 | 1985-06-14 | Hitachi Tobu Semiconductor Ltd | Microcomputer system |
-
1987
- 1987-08-28 JP JP62215924A patent/JPS6458004A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57125423A (en) * | 1981-01-28 | 1982-08-04 | Jeco Co Ltd | Power supply device for battery driven microcomputer |
JPS60108923A (en) * | 1983-11-18 | 1985-06-14 | Hitachi Tobu Semiconductor Ltd | Microcomputer system |
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