MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -Serial communication (also called RS232 communication) enables a microcontroller to communicate with other devices using the serial RS232 communication protocol. For example, a microcontroller can be connected to another microcontroller or to a PC and exchange data using the serial communication protocol.

Detailed explanation-2: -In computing, a serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. This is in contrast to a parallel port, which communicates multiple bits simultaneously in parallel.

Detailed explanation-3: -The 8051’s serial communication UART circuitry divides the machine cycle frequency of 921.6kHz by 32 once more before it is used by Timer 1 to set the baud rate. Therefore, 921.6 kHz divided by 32 gives 28, 800 Hz. SBUF is an 8-bit register used solely for serial communication in the 8051.

Detailed explanation-4: -Serial communication is used for transmitting data over long distances. It is much cheaper to run the single core cable needed for serial communication over a long distance than the multicore cables that would be needed for parallel communication.