Real Time Clock Using PIC Micro

Mohd Faizal , Razali (2007) Real Time Clock Using PIC Micro. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This PIC project uses a 12C Real Time Clock IC (DS1307) and a four digit seven segment display to create a standard desk clock. The OS 1307 serial real time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of Nonvolatile (NV) SRAM. Its transfer by bidirectional bus means address and data are transferred serially through an Integrated Circuit. This clock or calendar provides seconds, minutes, hours, date, month, and year information. The 16F877 is to retarget able to other PICs that have Analogue input ANO. For the accuracy, a watch crystal spec typically 20ppm is used. Switching between input and output to read analogue or drive di splay by using 12C routines. Special care must be taken in placing the OS 1307 and the crystal. For battery backup lost seconds as power applied-solved by not writing to chip at all if already initialized. Real-Time Clock (RTC) Counts Seconds, minutes, Hours, Date of the Month, Month, Day of the week, and Year with Leap-Year Compensation Valid Up to 2099.

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