In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

I suppose, but my experiences with these RTC chips is that there hasn't been sufficient reason for me to think they are any less accurate than my PC RTC, or my wrist watch.  So I continue to use them.  The only thing I ever used the 60hz pulse from AC for was as an NMI interrupt on my Z80 controller boards for updating the displays and clock information in RAM.

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