The 8051 has only single SBUF register.

Which of the following is the function of Pcon register in 8051?

The PCON or Power Control register, as the name suggests is used to control the 8051 Microcontroller’s Power Modes and is located at 87H of the SFR Memory Space. Using two bits in the PCON Register, the microcontroller can be set to Idle Mode and Power Down Mode.

What is meaning of RB8 in SCON?

RB8 – in mode 2/3 it is the 9th bit that was received in mode 1 if SM2 =0, RB8 is the stop bit that was received in mode it is not used. TI – transmit interrupt flag set by hardware at the end of 8 bit time in mode 0 at the beginning of the stop bit in the other mode it must be cleared by software.

What is Sbuf in embedded system?

SBUF holds the byte of data when it is received by 8051 RxD line. When the bits are received serially via RxD, 8051 deframes it by removing the stop and start bits, making a byte out of the data received, and then places it in SBUF register.

What is the purpose of PSW register?

The Program Status Word (PSW) contains status bits that reflect the current CPU state. The 8051 variants provide one special function register called PSW with this status information. The 251 provides two additional status flags, Z and N, that are available in a second special function register called PSW1.

What is Pcon register?

The PCON or Power Control register, as the name suggests is used to control the 8051 Microcontroller’s Power Modes and is located at 87H of the SFR Memory Space. Using two bits in the PCON Register, the microcontroller can be set to Idle Mode and Power Down Mode.

What are the registers in the 8051 microcontroller?

The most widely used registers of the 8051 are A (accumulator), B, R0-R7, DPTR (data pointer), and PC (program counter). All these registers are of 8-bits, except DPTR and PC.

What are the special purpose registers of 8051?

The Counters and Timers in 8051 microcontrollers contain two special function registers: TMOD (Timer Mode Register) and TCON (Timer Control Register).

What is the Sbuf explain its importance in communication based on 8051?

SBUF is an 8-bit register used solely for serial communication in the 8051. For a byte of data to be transferred via the TxD line, it must be placed in the SBUF register. Similarly, SBUF holds the byte of data when it is received by the 8051 ‘s RxD line. SBUF can be accessed like any other register in the 8051.

What is the role of the Sbuf register in serial data transfer?

SBUF REGISTER:

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 SFR in 8051 microcontroller?

In the 8051, register A, B, DPTR, and PSW are a part of the group of registers commonly referred to as SFR (special function registers). An SFR can be accessed by its name or by its address. A special function register can have an address between 80H to FFH.

What is the function of REN bit of SCON register?

The REN bit of SCON register can be used to enable or disable the serial reception. When REN = 1, the serial reception is enabled and when REN = 0, the serial reception is disabled. The bits TI and RI of SCON register are transmitting interrupt flag and receive interrupt flag respectively.

What are registers used for serial communication in 8051?

8051 uses the SBUF register for Serial Communication which is explained below: SBUF register: SBUF is an 8-bit register used for serial communication in the 8051 microcontrollers.

What is the length of TCON register in 8051?

Timer Control Register (TCON): TCON is another register used to control operations of counter and timers in microcontrollers. It is an 8-bit register wherein four upper bits are responsible for timers and counters and lower bits are responsible for interrupts.

What is the use of RS232 port?

RS232 is a standard protocol used for serial communication, it is used for connecting computer and its peripheral devices to allow serial data exchange between them. As it obtains the voltage for the path used for the data exchange between the devices.

Which register in 8051 holds Ri and Ti flag?

The mode of operation of the 8051 serial port is set by writing to the serial port mode register (SCON) at address 99H. The receive and transmit interrupt flags (RI and TI) in SCON play an important role in 8051 serial communications.