JPS57175279A - Leap year correcting circuit of digital timepiece - Google Patents

Leap year correcting circuit of digital timepiece

Info

Publication number
JPS57175279A
JPS57175279A JP56060782A JP6078281A JPS57175279A JP S57175279 A JPS57175279 A JP S57175279A JP 56060782 A JP56060782 A JP 56060782A JP 6078281 A JP6078281 A JP 6078281A JP S57175279 A JPS57175279 A JP S57175279A
Authority
JP
Japan
Prior art keywords
data
circuit
leap year
date
timepiece
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
JP56060782A
Other languages
Japanese (ja)
Inventor
Koji Tanigawa
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP56060782A priority Critical patent/JPS57175279A/en
Priority to DE8282103270T priority patent/DE3268926D1/en
Priority to AT82103270T priority patent/ATE17892T1/en
Priority to EP82103270A priority patent/EP0063771B1/en
Publication of JPS57175279A publication Critical patent/JPS57175279A/en
Priority to US06/536,237 priority patent/US4447160A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G99/00—Subject matter not provided for in other groups of this subclass
    • G04G99/006—Electronic time-pieces using a microcomputer, e.g. for multi-function clocks

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)

Abstract

PURPOSE:To ensure an assured correction for the leap year with a simple timepiece circuit, by setting a timepiece circuit at the date mode of a leap year based on the result of comparison between the date data of the timepiece circuit and the leap year data of a memory. CONSTITUTION:When an electric power supply is applied, a CPU 1 reads the date time data of a timepiece circuit 6 via a bus 2. Then the year data of the date data is compared with the leap year data of an ROM 3 to discriminate a leap year, and then whether the date is on and after February 29 is decided. In case the data is before February 29, the circuit 6 continues the counting. An FF 7 keeps the set mode. The CPU 1 checks the output state of the FF 7 in case the circuit 6 indicates March 1. When the set mode, i.e., the uncorrected mode is recognized, the data on March 1 which is read out of the circuit 6 is replaced with the data on February 29 read out of the ROM 3 to be supplied to the circuit 6. Then the data of the circuit 6 is corrected.
JP56060782A 1981-04-22 1981-04-22 Leap year correcting circuit of digital timepiece Pending JPS57175279A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56060782A JPS57175279A (en) 1981-04-22 1981-04-22 Leap year correcting circuit of digital timepiece
DE8282103270T DE3268926D1 (en) 1981-04-22 1982-04-19 Leap year compensation system
AT82103270T ATE17892T1 (en) 1981-04-22 1982-04-19 LEAP YEAR COMPENSATION SYSTEM.
EP82103270A EP0063771B1 (en) 1981-04-22 1982-04-19 Leap year compensation system
US06/536,237 US4447160A (en) 1981-04-22 1983-09-28 Leap year compensation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56060782A JPS57175279A (en) 1981-04-22 1981-04-22 Leap year correcting circuit of digital timepiece

Publications (1)

Publication Number Publication Date
JPS57175279A true JPS57175279A (en) 1982-10-28

Family

ID=13152199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56060782A Pending JPS57175279A (en) 1981-04-22 1981-04-22 Leap year correcting circuit of digital timepiece

Country Status (1)

Country Link
JP (1) JPS57175279A (en)

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