If your design contains Microchip’s MCP79XXX series RTC chips and you are running into troubles using them, this technical brief is intended to resolve several of the commonly-asked questions regarding developing stand-alone serial interface real-time clock/ calendar devices with MCP79XXX. Similarly,
there’s also another application note from Microchip which provides detail assistance and guidance in using these RTC devices.
For more detail: Recommended Usage of Microchip Serial RTCC Devices
