A Real-Time Clock is like a watch – it runs on a battery and keeps time even when there is a power outage.RTC keeps track of seconds, minutes, hours, date of the month, month, day of month and year with leap year compensation which is valid up to the year 2100.
- DS1307 is an I2c based serial real-time clock (RTC).
- The clock can be programmed to operate either in 12-hour or 24-hour format.
- DS1307 requires very less number of components to operate.
- RTC DS1307 operates in a frequency of crystal oscillator 32.768kHz.
- DS1307 uses I2C Protocol.
- RTC act as a slave device and I2C Master can read/write register of RTC.
- To communicate with the slave device, the master needs the slave address of the device connected on the bus.
- DS1307 has fixed slave address.
- Slave Address
7-Bit format: 0b1101000 = 0x68
Slave address for I2C Write: 0b11010000 = 0xD0
Slave address for I2C Read: 0b11010001 = 0xD1.
- Digital Clock.
- 3.3v Cmos battery.
- Atmega16 MicroController.
- SCL and SDA to port pins.