JPS56137267A - Clock operating method using microcomputer - Google Patents

Clock operating method using microcomputer

Info

Publication number
JPS56137267A
JPS56137267A JP4052180A JP4052180A JPS56137267A JP S56137267 A JPS56137267 A JP S56137267A JP 4052180 A JP4052180 A JP 4052180A JP 4052180 A JP4052180 A JP 4052180A JP S56137267 A JPS56137267 A JP S56137267A
Authority
JP
Japan
Prior art keywords
clock
power failure
time
commercial
frequency
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
JP4052180A
Other languages
Japanese (ja)
Inventor
Sumio Nakagawa
Takeshi Imaizumi
Norio Tanaka
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4052180A priority Critical patent/JPS56137267A/en
Publication of JPS56137267A publication Critical patent/JPS56137267A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Power Sources (AREA)

Abstract

PURPOSE:To make it possible to operate a clock even in case of power failure by a method wherein a specified program is run before power failure in order to measure a unit of time, and in case of power failure, a clock is operated according to said unit and the number of time of running the specified program. CONSTITUTION:A specified program, which executes and terminates a command in a definite period of time, is run in order to count the number of times of running within a given period of time according to a commercial AC frequency. Said measured value F0 is stored in the data area of a memory 2. Said measurement is that of the oscillation frequency of an oscillation circuit 3. When a commercial AC supply source 4 is being supplied, a clock is operated by using the commercial AC frequency as a reference clock, while in case of power failure, the clock is operated by using the oscillation frequency of the oscillation circuit 3 included in a microcomputer 1 itself as a reference clock and the number F0 of times of running measured before the power failure as a unit of time.
JP4052180A 1980-03-31 1980-03-31 Clock operating method using microcomputer Pending JPS56137267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4052180A JPS56137267A (en) 1980-03-31 1980-03-31 Clock operating method using microcomputer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4052180A JPS56137267A (en) 1980-03-31 1980-03-31 Clock operating method using microcomputer

Publications (1)

Publication Number Publication Date
JPS56137267A true JPS56137267A (en) 1981-10-27

Family

ID=12582805

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4052180A Pending JPS56137267A (en) 1980-03-31 1980-03-31 Clock operating method using microcomputer

Country Status (1)

Country Link
JP (1) JPS56137267A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002365383A (en) * 2001-06-08 2002-12-18 Fujitsu Ltd Temperature correction method of real-time clock and processor equipped with the real-time clock

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002365383A (en) * 2001-06-08 2002-12-18 Fujitsu Ltd Temperature correction method of real-time clock and processor equipped with the real-time clock
JP4711546B2 (en) * 2001-06-08 2011-06-29 富士通株式会社 Temperature correction method for real-time clock and processing device provided with real-time clock

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