07-21-2023, 02:14 AM
1.download the code the serial port print the time
2.power off and install CR1220
3.power on and read the time again(before power off the time is 10:02:45,and power on the time is 10:03:57)
2.power off and install CR1220
3.power on and read the time again(before power off the time is 10:02:45,and power on the time is 10:03:57)