I wonder if nrf51822 has a clock inside it. It doesn't need to be real clock
but It's important to me. I store datas on flash and send it to the phone when it's ready to send.
But there is no guarantee that device is alive. so I store its time together when they are stored. so that I could send it with time difference from now.
but I have to need a clock for the case that battery is gone.
So is there a clock like?