Terminal device and real-time clock control method therefor...

Details Terminal device and real-time clock control method therefor... Terminal device and real-time clock control method therefor...

2005-08-30

2005-08-30

Butler, Dennis M. (Department: 2115)

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

C713S400000

Reexamination Certificate

active

06938178

ABSTRACT:
A terminal device such as a mobile terminal is provided with two real-time clocks which are powered by different power sources: a first real-time clock which is built in a control section (built-in microcomputer1,for example) of the terminal device; and a second real-time clock which is provided outside the control section. At power-on of the mobile terminal or on recovery from failure such as a power cut, clock/calendar information is read out from the second real-time clock and is set to the first real-time clock, and thereafter, the control section obtains the clock/calendar information from the first real-time clock. The second real-time clock is connected to the control section directly by a signal line or via a functional device, or the second real-time clock is built in a functional device which is connected to the control section. By such composition and operation, the clock/calendar information can be maintained reliably and correctly even if failure occurred to the control section. The readout of the clock/calendar information is carried out usually from the first real-time clock (built-in RTC), therefore, high readout speed can be realized.

REFERENCES:
patent: 5175699 (1992-12-01), Podkowa et al.
patent: 5216357 (1993-06-01), Coppola et al.
patent: 5941915 (1999-08-01), Federle et al.
English Translation of the Chinese Office Action dated Oct. 24, 2003.

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