The is a Universal Synchronous/Asynchronous Receiver/Transmitter packaged in a pin DIP made by Intel. It is typically used for serial communication. The is a USART (Universal Synchronous Asynchronous Receiver Transmitter) for serial data communication. As a peripheral device of a microcomputer. transmitter. Transmitter section receives parallel data from the microprocessor over the data bus. The character is then automatically framed with the start.

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Pin Diagram of and Microprocessor.

Features of Microcontroller

In “synchronous mode,” the baud rate is the same as the frequency of RXC. This is an output terminal which indicates that the has transmitted all the characters and had no data character.

A buffer register to hold eight bits and an output register to convert eight bits into a stream of serial bits. It is also possible to set the device in “break status” low level by a command.

Interfacing with Intel CPU Structure.

Modular Programming in Microprocessor. Programming Techniques using It is possible to set the status RTS by a command.

Intel – Wikipedia

That is, the writing of a control word after resetting will be recognized as a “mode instruction. In the synchronous mode the receiver simply receives the specified number of data bits and transfers them to the receiver input register and then to the receiver buffer register. Operation between the and a CPU is executed by program control. The second 2-bit field D 3 -D 2 determines number of data bits in one character. The Block Diagram of Microcontroller allow the programmer to read above mentioned information from the status register any time during the functional operation.


In “external synchronous mode, “this is an input terminal. A “High” on this input forces the to start receiving data characters. Instruction and Data Format of Timers and Counters in Microcontroller. The bit configuration of status word is shown in Fig. Address Decoding Techniques in Mcirocontroller.

Select your Language English. The parity bit is added to the data bits only if parity is enabled.

A high on this line mixrocontroller that the output buffer is empty. It supports standard asynchronous protocol with:. Pin Diagram of The third 2-bit field, D 5 -D 4controls the parity generation.

Leave a Reply Cancel reply Your email address will not be published. Your email address will not be published. The last field, D 7 -D 6has two meanings depending on whether operation is to be in the synchronous or asynchronous mode. It is compatible with an extended range of Intel microprocessors.

Intel 8251

This is the “active low” input terminal which receives a signal for reading receive data and status words from the Interfacing with In “synchronous mode,” the baud rate will be the same as the frequency of TXC. The CPU is supposed to read this character before reception of the next character. In the receiver section received character is stored in the receiver buffer. Your email address will not be published.

It is possible to set the status of DTR by a command. In “asynchronous mode,” it is possible to select the baud rate factor by mode instruction. RxC is equivalent to the baud rate, and is supplied by the modem. Seven Segment Display Interfacing. These error bits are reset by setting ER bit in the command instruction. As the transmitter is disabled by setting CTS “High” or command, data written before disable will be sent out. This device also receives serial data from microconhroller outside and transmits parallel data to the CPU after conversion.


The CPU writes a byte in the buffer register, Which is transferred to the output register when it is empty. In “synchronous mode,” the terminal is at high level, if transmit data characters are no microcontroler remaining and sync characters are automatically transmitted. The bit configuration of mode instruction is shown in Figures 2 and 3.

The falling edge of TXC sifts the serial data out of the Short Circuit of a Loaded Synchronous Ma In the case of synchronous mode, it is necessary to write one-or two byte sync characters.

Interrupt Structure of This line can be used either to indicate the status in microconyroller status register or to interrupt the CPU. This is an output terminal for transmitting data from which serial-converted data is sent out.

Pin Diagram of Microcontroller. If sync characters were written, a function will be set because the writing of sync characters constitutes part of mode instruction.