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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

Publishing Venue

Motorola

Related People

Authors:
Kenneth R. Surch 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.