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Wide Range Timer Using Counter with Adjustable Length for Scientific Notation (Floating Point)

IP.com Disclosure Number: IPCOM000049393D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Partridge, JE: AUTHOR

Abstract

A counter has a selected number of stage that are continuously displayed to a user and a larger number of stages that are not displayed. A count begins at the low-order stage that is displayed. At each overflow of the counter the length of the counter is increased by one decade stage and a 1 is added to a second counter that holds the number of decimal positions of the count.

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Wide Range Timer Using Counter with Adjustable Length for Scientific Notation (Floating Point)

A counter has a selected number of stage that are continuously displayed to a user and a larger number of stages that are not displayed. A count begins at the low-order stage that is displayed. At each overflow of the counter the length of the counter is increased by one decade stage and a 1 is added to a second counter that holds the number of decimal positions of the count.

Some applications for a counter or timer require a count over a very wide range. A common example is a timer for testing programs that can run for a very short time or for quite a long time. A counter in scientific notation provides this range. In a hand-held calculator with scientific notation, for example, four display positions show the most significant digits and two display positions show the number of positions that the decimal point is to be shifted.

This timer has a chain of decade stages and an oscillator that supplies pulses to advance the counter, as is conventional. However, these pulses are initially directed to only a few high-order stages of the chain. These high-order stages are displayed continuously. A carry-out or overflow signal from the high-order stage signals that the counter has run through its maximum count for its length and is resetting to all zeros. When this overflow occurs, the oscillator input is switched one decade stage in the low-order direction so that, for the ne...