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8251A-USART and Interfacing with 8086 Video Lecture - Computer Science Engineering (CSE)

Q: 2. What are the key features of 8251A USART?

Ans. The key features of 8251A USART include:- Full duplex operation: It can transmit and receive data simultaneously.- Programmable baud rate: The baud rate can be set according to the desired communication speed.- Internal clock generator: It has an internal clock generator that provides the necessary timing for data transmission and reception.- Handshaking signals: It supports various handshaking signals like RTS (Request to Send), CTS (Clear to Send), DTR (Data Terminal Ready), and DSR (Data Set Ready).- Error detection: It has built-in error detection mechanisms like parity bit generation and checking.

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FAQs on 8251A-USART and Interfacing with 8086 Video Lecture - Computer Science Engineering (CSE)

1. What is USART and how does it interface with 8086?

Ans. USART stands for Universal Synchronous/Asynchronous Receiver Transmitter. It is a type of communication interface that allows the microprocessor to communicate with external devices. USART can operate in both synchronous and asynchronous modes. When interfacing with 8086, the USART is connected to the microprocessor's data and control lines, enabling data transmission and reception between the 8086 and external devices.

2. What are the key features of 8251A USART?

Ans. The key features of 8251A USART include: - Full duplex operation: It can transmit and receive data simultaneously. - Programmable baud rate: The baud rate can be set according to the desired communication speed. - Internal clock generator: It has an internal clock generator that provides the necessary timing for data transmission and reception. - Handshaking signals: It supports various handshaking signals like RTS (Request to Send), CTS (Clear to Send), DTR (Data Terminal Ready), and DSR (Data Set Ready). - Error detection: It has built-in error detection mechanisms like parity bit generation and checking.

3. How does the 8251A USART transmit and receive data?

Ans. The 8251A USART uses a serial communication method to transmit and receive data. For transmission, the microprocessor writes the data to be transmitted into the transmit buffer register of the USART. The USART then converts this parallel data into serial format and transmits it bit by bit through the serial data line. For reception, the USART receives the serial data bit by bit and converts it back into parallel format. The received data is then stored in the receive buffer register, which can be read by the microprocessor.

4. What is the role of handshaking signals in USART communication?

Ans. Handshaking signals play a crucial role in USART communication. They are used to coordinate the flow of data between the USART and the external device. The handshaking signals ensure that the transmitting and receiving devices are ready to send and receive data. The Request to Send (RTS) signal is used by the transmitting device to indicate that it is ready to send data. The Clear to Send (CTS) signal is used by the receiving device to indicate that it is ready to receive data. The Data Terminal Ready (DTR) and Data Set Ready (DSR) signals are used for additional control and synchronization purposes.

5. How can the baud rate be programmed in the 8251A USART?

Ans. The baud rate in the 8251A USART can be programmed using a divisor value. The divisor value is calculated based on the desired baud rate and the system clock frequency. To program the baud rate, the microprocessor writes the divisor value into the appropriate control register of the USART. The USART then uses this divisor value to generate the necessary clock pulses for data transmission and reception. By selecting the appropriate divisor value, the desired baud rate can be achieved, allowing for reliable and efficient communication between the 8251A USART and external devices.

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	Nov 30, 2024 Last updated

8251A-USART and Interfacing with 8086 for Computer Science Engineering (CSE)2024 is part of Computer Science Engineering (CSE) preparation. The notes and questions for 8251A-USART and Interfacing with 8086 have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about 8251A-USART and Interfacing with 8086 covers all important topics for Computer Science Engineering (CSE)2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for 8251A-USART and Interfacing with 8086.

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