The DS1307 Timekeeping Chip contains a real time clock/calendar and 56 bytes of static RAM. It communicates with a microprocessor via the I2C serial interface. The real time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with less than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator.
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| The photo above is of a DS1307 mounted in
the application area of the MC68HC11
EVBplus
Development board, from WYTEC. The software uses the LED display on the
board to display as well as on the terminal. The software uses a bit-bang method to implement the I2C protocol. If you are not using the EVBplus board you can remove the equate line at the start of the source file and reassemble. This will remove the LED interface routine. The include file should be useable with most MC68HC11's and MC68HC12's. In the future I expect to post versions for the MC68HC908's and the versions of MC9S08's and MC9S12's that use the built-in Inter-Integrated Circuit Module. |
| Click here to get HC11 software for the DS1307 |
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Freescale has an application note AN1759 that describes the chip and its use with the MC68HC705J1A with software.
Sparkfun has a small module with a DS1307.
See also my Software for the DS1302 page
Roger's
Embedded Microcontrollers Home Page
This page written by Roger Schaefer. Last
updated June 11, 2008