RTC计算器
什么是实时时钟RTC？RTC实时时钟的含义是什么？在嵌入式系统中，RTC提供可靠的系统时间，并且在系统关闭的情况下需要正常操作。外围设备不需要太多的辅助电路。通常，只需要高精度的32.768KHz晶体以及电阻器和电容器。
The calculator converts the clock precision parts per million (PPM) into real-time accuracy expressed in seconds per day or minutes per year.
Input parameters: PPM, seconds/day or minute/year, click the “Calculate” button to get other calculated values.
The calculator determines the crystal frequency error (PPM) caused by the crystal temperature characteristics; in addition, the equivalent error value in seconds per day is given.