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Because I have not tested all electronic circuits mentioned on this pages, I cannot attest to their accuracy; therefore, I do not provide a warranty of any kind and cannot be held responsible in any manner.
PIC-based real-time clock with DS1307
27. July 2008 - 12:02 — admin
This PIC project uses an I2C Real Time Clock IC (DS1307) and a four digit seven segment display to create a standard desk clock.
The DS1307 (RTC) Real Time Clock IC (an I2C real time clock) is an 8 pin device using an I2C interface (although the data sheet does not mention I2C to avoid royalty payments!).
You can use any PIC microcontroller that has an ADC and enough memory to hold the program and enough pins for the display multiplexing.
Link: A Real Time Clock IC (DS1307) project using the PIC micro