(19)
(11) EP 0 347 249 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.03.1991 Bulletin 1991/12

(43) Date of publication A2:
20.12.1989 Bulletin 1989/51

(21) Application number: 89306144.0

(22) Date of filing: 16.06.1989
(51) International Patent Classification (IPC)4: G04C 3/14
(84) Designated Contracting States:
CH DE FR GB LI

(30) Priority: 17.06.1988 JP 150873/88

(71) Applicant: SEIKO EPSON CORPORATION
Shinjuku-ku Tokyo-to (JP)

(72) Inventors:
  • Yabe, Hiroshi c/o Seiko Epson Corporation
    Suwa-shi Nagano-ken (JP)
  • Moriya, Tatsuo c/o Seiko Epson Corporation
    Suwa-shi Nagano-ken (JP)

(74) Representative: Sturt, Clifford Mark et al
J. MILLER & CO. 34 Bedford Row, Holborn
London WC1R 4JH
London WC1R 4JH (GB)


(56) References cited: : 
   
       


    (54) An IC chip for an analog electronic watch


    (57) An IC chip (20) for an analog electronic watch has a core CPU (201), a program memory (202) for storing software for actuating the core CPU, and a motor drive controlling circuit (212) for controlling a plurality of step motors according to commands of the software. An analog electronic watch having such an IC chip also has a plurality of step motors, and at least one gear train mechanism to couple each step motor to a rotatable indicator hand. Drive of the step motors can be controlled arbitrarily according to the software stored in the program memory.







    Search report