参考手册中关于RTC prescaler load register的描述：If the input clock frequency (fRTCCLK) is 32.768 kHz, write 7FFFh in this register to get a signal period of 1 second.只要给这个寄存器写的值大于7FFFh就比一秒长了啊
If you used inpute colck is 32.768 and wrote the 7FFFH in the register , you can get a signal period of 1 second .
of course, you can write other value into the register .
for example :
if you write 3FFFH into register , I think you will get a signal period of 2 second.
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