In the Arthur and DW ActiMates (https://news.ycombinator.com/item?id=36656190 https://news.ycombinator.com/item?id=36656190), my teammate, Craig Ranta, implemen

In the Arthur and DW ActiMates (https://news.ycombinator.com/item?id=36656190 https://news.ycombinator.com/item?id=36656190), my teammate, Craig Ranta, implemented the Real Time Clock using a Microchip 12C508 or 12C509. It ran at 32.768 kHz. Using the microcontroller was advantageous because we could implement a custom interface (data and wake up alarm signaling) to the main microcontroller, the functionality was exactly what we wanted, super low power and very inexpensive. He had to deal with complications like maintaining the time, running the interface, maintaining the alarm, all at the same time.