And for transmitting any data you have to put the content into the SBUF register; as soon as you can put content to the SBUF register the serial communication starts.
सिरीयल कम्युनिकेशन सुरू होण्यासाठी कोणताही डेटा तुम्ही ह्या SBUF रेजीस्टर मध्ये ठेवू शकता.