MIKROE-2063 RTC6 click Mikroe MIKROE-2063 RTC6 click tracks hours, minutes, seconds, days, months, years, and weekdays with the Microchip MCP79410 Real-Time Clock/Calendar IC. The MCP79410 has 64 bytes of battery-backed SRAM and backup power is supplied by a coin-cell Lithium battery. Clock frequency is derived from an onboard 32.768KHz crystal oscillator. The RTC6 communicates with the MCU through a mikroBUS™ I2C interface (SCL, SDA) along with a multifunction pin (MFP, in place of default mikroBUS™ INT pin). This Mikroe board is designed to use either a 3.3V or a 5V power supply.