Add accurate timekeeping to MCU system

The MAXQ610 microcontroller does not include a battery-backed real-time clock (RTC). However, the flexibility of the 1-Wire network makes it straightforward to add a DS1904 RTC iButton to any MAXQ610-based application. Communicating with the DS1904, setting the clock and control values, and converting time values to and from a raw seconds count are all well within the capabilities of the MAXQ610, even when using assembly language. This application note explains how to add RTC functionality to a MAXQ610-based application. Demonstration code for implementing this application is shown. The principles and techniques in this article apply equally well to any other MAXQ-based microcontroller that has general-purpose I/O (GPIO) pins capable of driving the 1-Wire communications protocol.

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Originally published by Maxim Integrated Products at www.maxim-ic.com as "Real-Time Clock Adds Accurate Timekeeping to Microcontroller System".