Horology: time measuring systems or devices – Chronological – With electro-optical display
Patent
1979-02-21
1981-04-14
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With electro-optical display
368155, G04C 1900, G04C 1500
Patent
active
042623529
ABSTRACT:
Disclosed is an electronic multifunction timepiece employing the PLA system, including a key input circuit, a clock pulse generator circuit, a random access memory which stores time data therein, an adder circuit, and a read only memory which stores therein control instructions for controlling operations of said random access memory and said adder circuit and for causing said random access memory to write renewed time data and which provides the control signals sequentially on the basis of clock pulses of said clock pulse generator circuit, characterized in that said read only memory comprises a first read only memory which stores therein control signals for renewing the time data of said random access memory independently or operation modes appointed by said key input circuit, and a second read only memory which stores therein control instructions for controlling information processing operations in the operation modes appointed from said key input circuit.
REFERENCES:
patent: 4063409 (1977-12-01), Bayliss
patent: 4093992 (1978-06-01), Kawamura et al.
patent: 4158285 (1979-06-01), Heinsen et al.
Ito Takashi
Kobayashi Isamu
Hitachi , Ltd.
Miska Vit W.
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