{"id":86476,"date":"2024-08-24T08:00:14","date_gmt":"2024-08-24T06:00:14","guid":{"rendered":"https:\/\/botland.com.pl\/blog\/real-time-clock-what-is-it-and-what-is-it-used-for\/"},"modified":"2026-04-08T10:52:30","modified_gmt":"2026-04-08T08:52:30","slug":"real-time-clock-what-is-it-and-what-is-it-used-for","status":"publish","type":"post","link":"https:\/\/botland.store\/blog\/real-time-clock-what-is-it-and-what-is-it-used-for\/","title":{"rendered":"Real-time clock &#8211; What is it and what is it used for?"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading time:<\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span>\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"86476\" class=\"elementor elementor-86476 elementor-75658\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-504068e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"504068e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1e34d3b\" data-id=\"1e34d3b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-456f549 elementor-widget elementor-widget-text-editor\" data-id=\"456f549\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Have you ever wondered how electronic devices keep accurate time no matter what?<br \/>\nThe real-time clock (RTC) plays a key role in this.<br \/>\nThis article will provide you with comprehensive information about the RTC, its functions, its importance in modern technology and the ways in which it is changing our everyday devices.<br \/>\nLearn more about this inconspicuous but extremely important component.   <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d5bb9c7 elementor-widget elementor-widget-heading\" data-id=\"d5bb9c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Introduction to the real-time clock<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-421a1ba elementor-widget elementor-widget-text-editor\" data-id=\"421a1ba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/botland.com.pl\/536-moduly-rtc\" target=\"_blank\" rel=\"noopener\" data-wpel-link=\"internal\"><strong>Real-time clock<\/strong><\/a>, also known as <a href=\"https:\/\/botland.com.pl\/536-moduly-rtc\" target=\"_blank\" rel=\"noopener\" data-wpel-link=\"internal\"><strong>RTC<\/strong><\/a>, is a key component in many digital systems.<br \/>\nAn RTC is an electronic device that accurately measures the passage of time.<br \/>\nThe definition of a real-time clock is that it is an integrated circuit that tracks the passage of time in real time, regardless of the status of the device in which it is installed.<br \/>\nIt does this by periodically counting pulses generated by a quartz oscillator.   <\/p>\n<p><strong>The main function of RTC<\/strong> is to provide an accurate time reference for embedded systems or computers, even when they are off or in sleep mode.<br \/>\nIn terms of real-time clock applications, the presence of RTC is essential in devices such as computers, smartphones, servers, GPS navigation systems, electronic watches or industrial control systems.<br \/>\nRTC allows for proper time tracking, a crucial element in today&#8217;s digital world, which places high demands on precise management and timekeeping.  <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d8da4f1 elementor-widget elementor-widget-heading\" data-id=\"d8da4f1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">History and development of RTC clocks<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-466b511 elementor-widget elementor-widget-text-editor\" data-id=\"466b511\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Development and history <a href=\"https:\/\/botland.com.pl\/536-moduly-rtc\" target=\"_blank\" rel=\"noopener\" data-wpel-link=\"internal\"><strong>real-time clock<\/strong><\/a> is a fascinating study of the application of technology to accurately measure the passage of time.<br \/>\nThe origins of RTC date back to the 1970s, when the first real-time clock appeared.<br \/>\nAt the time, the device was integrated into a computer, and its main task was to synchronize the system&#8217;s time, even when it was turned off.<br \/>\nThis was a novelty in the world of technology, and since then the rapid development of this technology began.   <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-b15acba elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b15acba\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-dab3254\" data-id=\"dab3254\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-813e317 elementor-widget elementor-widget-text-editor\" data-id=\"813e317\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Here are some landmarks in the history of the emergence of RTC clocks:<\/p>\n<ul style=\"font-size: 16px; background-color: #ffffff;\">\n<li style=\"font-size: 16px;\">in the 1980s. i 90. RTCs with built-in battery backup power emerged, allowing them to operate even when the main power supply was off;<\/li>\n<li style=\"font-size: 16px;\">In the early 2000s.<br \/>\nthe introduction of RTC into mobile devices such as cell phones and GPS navigators began; <\/li>\n<li style=\"font-size: 16px;\">Today, real-time clocks are an integral part of most electronic devices, serving to keep the time and date current, regardless of the state of the device.<\/li>\n<\/ul>\n<p>The world of technology is constantly evolving, and with it, real-time clocks are also evolving.<br \/>\nAs our technologies become more complex and integrated, real-time clocks remain a vital component in maintaining accurate time measurement. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-5fe1026\" data-id=\"5fe1026\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3d442c2 elementor-widget elementor-widget-image\" data-id=\"3d442c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2024\/08\/03790_11.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"03790_11\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6ODY0MDksInVybCI6Imh0dHBzOlwvXC9ib3RsYW5kLnN0b3JlXC9ibG9nXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDI0XC8wOFwvMDM3OTBfMTEuanBnIn0%3D\" data-wpel-link=\"internal\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/03790_11-1024x1024.jpg\" class=\"attachment-large size-large wp-image-86409\" alt=\"\" srcset=\"https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/03790_11-1024x1024.jpg 1024w, https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/03790_11-300x300.jpg 300w, https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/03790_11-768x767.jpg 768w, https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/03790_11.jpg 1080w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">DS3231 I2C RTC module - real-time clock.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6064ffc elementor-align-center elementor-widget elementor-widget-button\" data-id=\"6064ffc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/botland.com.pl\/moduly-rtc\/3790-modul-rtc-ds3231-i2c-zegar-czasu-rzeczywistego-5904422373788.html\" target=\"_blank\" data-wpel-link=\"internal\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">CHECK<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-2797872 elementor-widget elementor-widget-spacer\" data-id=\"2797872\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87888c6 elementor-widget elementor-widget-heading\" data-id=\"87888c6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Construction and working principle of the RTC<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-50756b9 elementor-widget elementor-widget-text-editor\" data-id=\"50756b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>The construction of <a href=\"https:\/\/botland.com.pl\/536-moduly-rtc\" target=\"_blank\" rel=\"noopener\" data-wpel-link=\"internal\">a real-time clock<\/a><\/strong> (RTC) is quite complex, and designing the operating mechanism requires precise engineering knowledge and experience.<br \/>\nThe RTC mainly consists of <strong>a quartz clock<\/strong>, <strong>an integrated circuit<\/strong> and <strong>a backup battery<\/strong>.<br \/>\nThe quartz clock generates regular oscillations, which are the basis for measuring the passage of time.<br \/>\nThe oscillations from the quartz clock are then counted by the integrated circuit to accurately track seconds, minutes, hours, days and so on.   <\/p>\n<p>The basis of the mechanism of a real-time clock is a counter, which measures time using a quartz clock.<br \/>\nThe RTC uses regular oscillations of the quartz to generate the timing for the counter.<br \/>\nWith each heartbeat, the counter increases its value by one.<br \/>\nWhen it reaches a certain value, it means that a second has elapsed and the counter is reset.   <\/p>\n<p>The RTC is also equipped with a battery backup that allows it to maintain the correct time even during a power outage.<br \/>\nThis functionality is crucial for many devices that need to maintain accurate time regardless of their power state.<br \/>\nIt is interesting to note that the RTC, due to its design and operating mechanism, is able to maintain accurate countdown time for many years, with an error of usually less than a few seconds per month.  <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-36be9b7 elementor-widget elementor-widget-heading\" data-id=\"36be9b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Applications of real-time clocks<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-345b936 elementor-widget elementor-widget-text-editor\" data-id=\"345b936\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/botland.com.pl\/536-moduly-rtc\" target=\"_blank\" rel=\"noopener\" data-wpel-link=\"internal\"><strong>The real-time clock<\/strong><\/a> is used in many areas of our lives &#8211; we often don&#8217;t even realize how many technologies and devices depend on its precise operation.<br \/>\nThe possibilities for using RTC are virtually limitless &#8211; from basic functions such as displaying the current time and date, to more advanced ones such as synchronizing data between devices or managing complex industrial systems. <\/p>\n<p>In everyday use, the real-time clock is indispensable in such mundane devices as watches, televisions, computers and smartphones.<br \/>\nAll of these devices continually use the RTC to maintain a precise countdown.<br \/>\nThis allows us, for example, to schedule a recording of a favorite TV show, set an alarm clock on our phone, or even use a GPS navigation system.  <\/p>\n<p>RTC applications in industry, meanwhile, include process control, machine control, time recording, etc.<br \/>\nAll this testifies to the key role that the real-time clock plays in the modern world, regardless of the context of its application. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d083161 elementor-widget elementor-widget-heading\" data-id=\"d083161\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The future and innovation in RTC technology<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-10f914a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"10f914a\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-1714b66\" data-id=\"1714b66\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e0859bf elementor-widget elementor-widget-image\" data-id=\"e0859bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/botland.com.pl\/blog\/wp-content\/uploads\/2024\/08\/02717_1.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"02717_1\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6ODY0MTQsInVybCI6Imh0dHBzOlwvXC9ib3RsYW5kLnN0b3JlXC9ibG9nXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDI0XC8wOFwvMDI3MTdfMS5qcGcifQ%3D%3D\" data-wpel-link=\"internal\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/02717_1-1024x1024.jpg\" class=\"attachment-large size-large wp-image-86414\" alt=\"\" srcset=\"https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/02717_1-1024x1024.jpg 1024w, https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/02717_1-300x300.jpg 300w, https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/02717_1-768x768.jpg 768w, https:\/\/botland.store\/blog\/wp-content\/uploads\/2024\/08\/02717_1.jpg 1080w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">MSX RTC DS1307 I2C real-time clock.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-102fa8e elementor-align-center elementor-widget elementor-widget-button\" data-id=\"102fa8e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/botland.com.pl\/moduly-rtc\/2717-msx-rtc-ds1307-i2c-zegar-czasu-rzeczywistego-5904422365288.html\" target=\"_blank\" data-wpel-link=\"internal\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">CHECK<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-41c2f9c\" data-id=\"41c2f9c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0f78e43 elementor-widget elementor-widget-text-editor\" data-id=\"0f78e43\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The future of the real-time clock (RTC) is full of exciting possibilities.<br \/>\nAs technology advances, innovations ensure that RTC becomes more advanced and functional.<br \/>\nThe main directions of future developments are:  <\/p>\n<ul style=\"font-size: 16px; background-color: #ffffff;\">\n<li style=\"font-size: 16px;\">greater precision and reliability &#8211; the goal is to provide even more accurate timekeeping;<\/li>\n<li style=\"font-size: 16px;\">greater integration &#8211; RTC can become an even more integrated part of the equipment, for even greater efficiency;<\/li>\n<li style=\"font-size: 16px;\">more widely used smart technology &#8211; will aim to accelerate IoT innovation.<\/li>\n<\/ul>\n<p>The evolution of RTC is constantly advancing, and the technology plays a key role in the modern world.<br \/>\nWe are witnessing how the future and innovations in real-time clock are becoming more and more promising. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Learn about the real-time clock (RTC) &#8211; a key device for electronic systems.<br \/>\nLearn what principles it operates on and what functions it performs. <\/p>\n","protected":false},"author":22,"featured_media":86421,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7,179],"tags":[],"class_list":["post-86476","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-elektronika","category-kompendium"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Real-time clock - What is it and what is it used for? - Botland<\/title>\n<meta name=\"description\" content=\"Learn about the real-time clock (RTC) - a key device for electronic systems. 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