Battery powered information terminal apparatus wherein the clock

Details Battery powered information terminal apparatus wherein the clock Battery powered information terminal apparatus wherein the clock

1991-08-06

1993-07-20

Fleming, Michael R.

Boots, shoes, and leggings

364707, 3642731, 364DIG1, G06F 132, G06F 130

Patent

active

052300560

ABSTRACT:
An information terminal apparatus has a capability of continuously operating, when a battery capacity drop is detected, and maintaining the battery capacity at a certain level for an extended period. When the battery capacity drops to cause a battery voltage generating circuit to generate a warning signal, a clock frequency switching circuit switches a clock signal from a normal frequency to a lower frequency, whereby the apparatus operates at a speed slower than before and accordingly consumes less current, so that even if the apparatus keeps operating, a time period available until it eventually stops can be prolonged. Therefore, a user can definitely recognize deterioration of the performance of the apparatus or slow-down of the operating speed due to a battery capacity drop. Also, since a time period available until the apparatus stops is longer, countermeasures such as exchanging or recharging the battery can be readily taken before the battery is completely used up.

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patent: 4317180 (1982-02-01), Lies
patent: 4365290 (1982-12-01), Nelms et al.
patent: 4461003 (1984-07-01), Tamaki
patent: 4611289 (1986-09-01), Coppola
patent: 4803459 (1989-02-01), Ta
patent: 4827111 (1989-05-01), Kondo
patent: 4843592 (1989-06-01), Tsuaki et al.
patent: 4907183 (1990-03-01), Tanaka

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