1 Real-Time Clock Calendar (RTCC) Overview

The RTCC module is an integrated 100-year clock and calendar with automatic leap year detection and correction. The range of the clock is from 00:00:00 (midnight) on January 1st, 2000 to 23:59:59 on December 31st, 2099. The RTCC module uses the 24-hour time format. The RTCC provides users with the ability to accurately keep track of time, date, and configure an alarm with an interrupt event. The RTCC module can be beneficial to use in applications where accurate time keeping is needed due to the module’s optimized low-power consumption, the ability to minimize CPU overhead, and the available VBAT external battery connect in the event of a VDD power failure. Some features of the RTCC module include:
  • Time: Hours, Minutes and Seconds
  • 24-Hour Time Format
  • Calendar: Weekday, Date, Month and Year (Year range: 2000 to 2099)
  • Leap Year Correction
  • Configurable Alarm
  • Half-second Synchronization and Visibility
  • BCD Format for Compact Firmware
  • User Calibration with Auto-Adjust
  • Multiple Clock Sources
  • Low-Power Optimization