IES950627A2 - Microprocessor real time clock - Google Patents

Microprocessor real time clock

Info

Publication number
IES950627A2
IES950627A2 IES950627A IES950627A2 IE S950627 A2 IES950627 A2 IE S950627A2 IE S950627 A IES950627 A IE S950627A IE S950627 A2 IES950627 A2 IE S950627A2
Authority
IE
Ireland
Prior art keywords
real time
time clock
signals
microprocessor real
int
Prior art date
Application number
Inventor
Aidan Darmody
Mark Shankey
Original Assignee
Itec Ireland R & D Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Itec Ireland R & D Limited filed Critical Itec Ireland R & D Limited
Priority to IES950627 priority Critical patent/IES950627A2/en
Publication of IES66230B2 publication Critical patent/IES66230B2/en
Publication of IES950627A2 publication Critical patent/IES950627A2/en
Priority to IE960525A priority patent/IE77524B1/en

Links

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  • Electric Clocks (AREA)
  • Microcomputers (AREA)

Abstract

In a microprocessor real time clock first signals (Int#2) produced by dividing the output of a crystal oscillator are counted to determine nominal fractions of a second, and the nominal fractions of a second are counted to determine the time. Second signals (Int#4) derived from the mains are used to adjust the counting of the first signals or the counting of the nominal fractions of a second to compensate for drift in the crystal oscillator frequency.
IES950627 1995-08-18 1995-08-18 Microprocessor real time clock IES950627A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IES950627 IES950627A2 (en) 1995-08-18 1995-08-18 Microprocessor real time clock
IE960525A IE77524B1 (en) 1995-08-18 1996-07-18 Microprocessor real time clock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IES950627 IES950627A2 (en) 1995-08-18 1995-08-18 Microprocessor real time clock

Publications (2)

Publication Number Publication Date
IES66230B2 IES66230B2 (en) 1995-12-13
IES950627A2 true IES950627A2 (en) 1995-12-13

Family

ID=11040851

Family Applications (1)

Application Number Title Priority Date Filing Date
IES950627 IES950627A2 (en) 1995-08-18 1995-08-18 Microprocessor real time clock

Country Status (1)

Country Link
IE (1) IES950627A2 (en)

Also Published As

Publication number Publication date
IES66230B2 (en) 1995-12-13

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Legal Events

Date Code Title Description
FD4E Short term patents deemed void under section 64