JPS5592962A - Electronic desk-top calculator - Google Patents

Electronic desk-top calculator

Info

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
Application number
JP50679A
Other languages
Japanese (ja)
Inventor
Teruaki Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP50679A priority Critical patent/JPS5592962A/en
Publication of JPS5592962A publication Critical patent/JPS5592962A/en
Pending legal-status Critical Current

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
JP50679A 1979-01-04 1979-01-04 Electronic desk-top calculator Pending JPS5592962A (en)

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)

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