JPS5592962A - Electronic desk-top calculator - Google Patents
Electronic desk-top calculatorInfo
- Publication number
- JPS5592962A JPS5592962A JP50679A JP50679A JPS5592962A JP S5592962 A JPS5592962 A JP S5592962A JP 50679 A JP50679 A JP 50679A JP 50679 A JP50679 A JP 50679A JP S5592962 A JPS5592962 A JP S5592962A
- Authority
- JP
- Japan
- Prior art keywords
- time
- unit
- arithmetic
- state
- rom1
- 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 eliminate the need for a time-count dedicated counter by enabing one part of an arithmetic register to serve as a counter, by counting by the arithmetic register the time between key operations, and then by stopping the power supply after a prescribed time.
CONSTITUTION: Signals from ROM1 for program storage are supplied to instruction decoder 2, which is connected to arithmetic controller 3 and power-supply stop unit 4. Unit 3 is connected to ROM1 and arithmetic register 5, and power supplies to respective parts are controlled by unit 4. Since a state in which key operation is possible is not an arithmetic state but a display state, one part of register 5 which is not used during display is used to count the time between key operations and when the part is placed in a prescribed state, unit 3 generates a signal to send a power-supply stop instruction from ROM1, thereby stopping power supplies to respective parts by controlling unit 4. Consequently, the need for a dedicated counter counting the time is eliminated, and consequently the area of an integrated circuit can be reduced.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50679A JPS5592962A (en) | 1979-01-04 | 1979-01-04 | Electronic desk-top calculator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50679A JPS5592962A (en) | 1979-01-04 | 1979-01-04 | Electronic desk-top calculator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5592962A true JPS5592962A (en) | 1980-07-14 |
Family
ID=11475644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP50679A Pending JPS5592962A (en) | 1979-01-04 | 1979-01-04 | Electronic desk-top calculator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5592962A (en) |
-
1979
- 1979-01-04 JP JP50679A patent/JPS5592962A/en active Pending
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