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What are the serial communication registers in 8051?
Serial control register SCON is used to set serial communication operation modes. Also it is used to control transmit and receive operations. Normally mode-1 (SM0 =0, SM1=1) is used with 8 data bits, 1 start bit, and 1 stop bit.
How many serial ports are there in 8051?
There are 21 Special function registers (SFR) in 8051 microcontroller and 21 unique locations are for these 21 SFR. Each of these register is of 1 byte size. The “Serial Control” (SCON) is the SFR which is used to configure serial port.
Which timer of 8051 is used in serial communication?
Timer 1
Both the devices Receiver and Transmitter should be set to same baud rate for successful communication. For the 8051 the Timer 1 is used to generate the baud rate in Auto reload mode. The crystal frequency Fosc is divided by 12 internally which is used to execute instructions also known as Machine Clock, Mosc.
Which register is used for serial communication?
SBUF is an 8-bit register used for serial communication in the 8051 microcontrollers.
Why is a serial port called serial?
The name “serial” comes from the fact that a serial port “serializes” data. That is, it takes a byte of data and transmits the 8 bits in the byte one at a time. The advantage is that a serial port needs only one wire to transmit the 8 bits (while a parallel port needs 8).
How does serial communication work in an 8051 microcontroller?
UART or Serial communication in 8051 microcontroller will allow the controller to send and receive data’s just by using two pins. Serial Communication uses only two data pins to establish communication between Microcontroller and external devices. In this mode of communication data is transferred one bit at a time.
Is the serial port of an 8051 full duplex?
Learn how to configure Timers in 8051. It is a 8 bit register that holds the data needed to be transmitted or the data that is received recently. The serial port of 8051 is full duplex so the microcontroller can transmit and receive data using the register simultaneously.
What is the role of UART in 8051?
In 8051 in built UART (Universal Asynchronous Receiver Transmitter) module performs the job of serial communication of data. Data communication process can be synchronous or asynchronous. The following points clearly discriminates between these two modes of data transfer-
What does SBUF mean in serial communication in 8051?
SBUF = ’U’; // load SBUF with the data that is required to be transmitted While (TI ==0); //stay on this line till TI=0 (wait until transmitted) Similarly during reception RI flag (Receive Interrupt Flag) plays a very important role. This flag must be monitored to check whether any data is received or not.