30 September 2021
Real time clock accuracy:
Accuracy of the real time clock is one second (%SW50) +/- 200ms.
Resolution of the real time clock is one second (%SW50) +/- 200ms,because 200ms is the refresh rate of the RTC.
The accuracy error of the quartz oscillator is:
1. At 0 and 70°C : -101/20 ppm, error in second/day is -8.7/1.7, in minute/year is -53/11.
2. At 25°C: -20/20 ppm, error in second/day is -1.7/1.7, in minute/year is -11/11.