Browse Prior Art Database

MULTIPLE SUPPLY SINGLE CHIP MICROCOMPUTER WITH DISPLAY AND REAL TIME CLOCK

IP.com Disclosure Number: IPCOM000005893D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-14
Document File: 1 page(s) / 103K

Publishing Venue

Motorola

Related People

Kenneth R. Surch: AUTHOR [+2]

Abstract

Described herein is an extremely low power micro-computer with time keeping functions. A single chip micro-computer with integral timekeeping function can be designed with separate power supply pins. This allows the computer to be completely shut down when it is not in use in order to minimize the operating current. A voltage sensing circuit is provided which ensures that the computer does not accidentally write incorrect data to the clock while the power supply voltage is too low for current operation.

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MOTOROLA Technical Developments Volume 10 March 1990

MULTIPLE SUPPLY SINGLE CHIP MICROCOMPUTER

WITH DISPLAY AND REAL TIME CLOCK

by Kenneth R. Surch and Andrew W. Cheung

ABSTRACT: Described herein is an extremely low power micro-computer with time keeping functions.

   A single chip micro-computer with integral timekeeping function can be designed with separate power supply pins. This allows the computer to be completely shut down when it is not in use in order to minimize the operating current. A voltage sensing circuit is provided which ensures that the computer does not accidentally write incorrect data to the clock while the power supply voltage is too low for current operation.

   Other functions, such as memory (RAM) and display drivers (LCD) can be powered by the clocks battery. Thus a product, such as a pager, can maintain the time of day and other vital data while providing the longest possible battery life. In addition, the computer battery can be replaced when needed without the need of resetting the time in the clock.

From VoI t Mul t Llthlum Battery

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0 Motorola. Inc. 1990

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