Title:
POSITION INFORMATION MEMORY USED FOR MOVING COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JPS5560353
Kind Code:
A
Abstract:
PURPOSE: To miniaturize and price low the circuit constitution of a position information memory by backing up an IC memory by using a car battery and DC-DC converter.
CONSTITUTION: A power voltage from a battery is converted by DC-DC converter 25 into power voltage VCC adequate for IC memory 23 before being supplied. On detecting VCC applied to IC memory 23 falling below a fixed value, power- voltage- variation detection circuit 26 inhibits the storage and read of a processor of control part 19 so as to prevent stored position information from breaking down.
Inventors:
KOMAGATA HITOSHI
OKASAKA SADAATSU
YOSHIDA HIROSHI
TSUBOI SATORU
OKASAKA SADAATSU
YOSHIDA HIROSHI
TSUBOI SATORU
Application Number:
JP13256878A
Publication Date:
May 07, 1980
Filing Date:
October 30, 1978
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
H04W60/00; H04B3/44; (IPC1-7): H04B7/26
Domestic Patent References:
| JPS5211627A | 1977-01-28 |