We are using LPC4357 and configured RTC to generate an interrupt every minute by writing 0x2 into Counter Interrupt Register . It has been running for a while as expected. Yesterday, we removed the board and put it back on (the same board) and date and time got disturbed – mentioned something like year 2047. So, we set the time correctly. After that RTC interrupt was occurring every second despite of configuring that occur every minute. Today morning we had single stepped and CIR register contain 0x2, we are clearing interrupt etc. Then it automatically got fixed. However, we would like to know the reason. Any idea?