RTC，英文全称：Real-time clock，中文名称：实时时钟，是指可以像时钟一様输出实际时间的电子设备，一般会是集成电路，因此也称为时钟芯片。实时时钟芯片是日常生活中应用最为广泛的消费类电子产品之一。它为人们提供精确的实时时间,或者为电子系统提供精确的时间基准,目前实时时钟芯片大多采用精度较高的晶体振荡器作为时钟源。(RTC, English full name: Real-time clock, Chinese Name: real time clock, refers to the electronic equipment can be a result of actual time clock output, usually is the integrated circuit, so it is also called the clock chip. The real-time clock chip is one of the most widely used consumer electronic products in daily life. It provides accurate real-time time, or provides accurate time reference for electronic system. At present, most of the real-time clock chips use higher precision crystal oscillator as the clock source.)