About SBUF Register in 8051 Microcontroller | New Topic

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In this note, we are going to learn about SBUF Register in 8051 Microcontroller. Welcome to Diploma to Degree, an ultimate solution for diploma and degree engineering notes.

Author Name: Arun Paul.  

SBUF Register in 8051 Microcontroller - diploma to degree

What is SBUF Register in 8051 Microcontroller?

The 8051 microcontroller's SBUF (Serial Buffer) register is a special function register (SFR) at address 99H that enables asynchronous serial communication over the UART. It serves as a dual-purpose register, sending and receiving data over the serial port.

Function of SBUF Register in 8051 in Asynchronous Data Transfer - 

A. Data Transmission

  • When the CPU wants to transfer a byte of data over the serial port, it writes it to the SBUF register.
  • The value is then automatically moved to the transmit shift register, which initiates the transmission bit by bit (asynchronous).
B. Data Reception

  • When data is received by the serial port, it is stored in the receive shift register.
  • When a whole byte is received, it is automatically stored in the SBUF register.

Structure of SBUF Register for Asynchronous Data Transfer (8051)

SBUF is a single register (address: 99H) in the memory map, however it behaves as two different registers internally:

SBUF (Write): Writing to SBUF sends the byte to the Transmit Shift Register, which outputs the data via the TXD pin (asynchronous serial transmission).

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