Here we will discuss how to configure RTC for Raspberry Pi B+.

1. Install the jumper on the headers labeled ‘RTC JMP’.

2. Enter the following command：

$i2cdetect -y 1

3. Now the I2C address of the PCF8563 will be displayed as following.  This means that PCF8563 has been detected by Raspberry Pi B+.

4. Run the following commands:

$modprobei2c-dev
$echo pcf8563 0x51 > /sys/class/i2c-adapter/i2c-1/new_device
$hwclock -r   // Read the RTC time of the I2C hardware

Now the time of PCF8563 will be printed in LXTerminal, which is different from the system time

5. Run the following commands:

$hwclock -w  //Write the system time of Raspberry Pi to PCF8563
$hwclock -r   //Read out the hardware time of PCF8563 
$hwclock -s   //Sync the system time of Raspberry Pi with PCF8563