Introduction

Real Time Clock (RTC) usually refers to the module that tracks wall clock time so that it works even with system power off. Such clocks will normally not track the local time zone or daylight savings time -- unless they dual boot with MS-Windows -- but will instead be set to Coordinated Universal Time (UTC, formerly "Greenwich Mean Time").

is equipped with the AT8563 RTC chip, which is a classic industrial grade real-time clock chip (RTC) with an I2C bus interface. It has the characteristics of low power consumption and high accuracy, and is widely used in products such as electricity meters, water meters, gas meters, telephones, etc.