needed. Centronic’s parallel printer interface. RS defines a serial communications standard. USART (Universal Synchronous/Asynchronous. The A Programmable Communication Interface. This Intel chip is capable of both synchronous and asynchronous bidirectional serial communication hence. Description, Programmable Communication Interface. Company, Intel Corporation. Datasheet, Download A datasheet. Cross ref. Similar parts: COM

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The receiver section is double buffered, i.

8251A programmable communication interface block diagram

In “external synchronous mode, “this is an input terminal. It is possible to set the status RTS by a command. Share with a friend. As a peripheral device of a microcomputer system, the receives parallel data from the CPU and transmits serial data after conversion. Similarly, it converts the serial data received on RxD receive data input into parallel data, and the processor reads it using the data pins D Already Have an Account?

If buffer register is empty, then TxRDY is goes to high. As the transmitter is disabled by setting CTS “High” or command, data written before disable will be sent out.

The terminal will be reset, if RXD programmabel at high level. It has gotten views and also has 4. It monitors the data flow. EduRev is like a wikipedia just for education and the A-Programmable Communication Interface – Microprocessors and Microcontrollers images and diagram are even better than Byjus!


The transmitter section accepts parallel data from CPU and converts them into serial data. The A converts the parallel data received from the processor on the D data pins into serial data, and transmits it on TxD transmit data output pin of A.

A programmable communication interface block diagram – Electronic Products

The A is a programmable serial communication interface chip designed for synchronous and asynchronous serial data communication. When the input register loads a parallel data to buffer register, the RxRDY line goes high.

The receiver section accepts serial ocmmunication and convert them into parallel data.

This is an output terminal for transmitting data from which serialconverted data is sent out. Features Compatible with extended range of Intel microprocessors. In “synchronous mode,” the terminal is at high level, if transmit data characters are no longer remaining and sync characters are cpmmunication transmitted. All inputs and outputs are TTL compatible. After Reset is active, the terminal will be output at low level.


When the input register loads a parallel data to buffer register, the RxRDY line goes high. A “High” on this input forces the into “reset status. Newer Post Older Post Home.

It has full duplex, double buffered transmitter and receiver. In “asynchronous mode”, it is possible to select the baud rate factor by mode instruction.

The receiver section accepts serial data and converts them into parallel data. When output register is empty, the data is transferred from buffer to output commuication.

CLK signal is used to generate internal device timing. If a status word is read, the terminal will be reset. Why do I need to sign in? The receiver section is double buffered, i.

Similarly, if receives serial data over long distances, the has to internally convert this into parallel data before processing it. The transmitter section is double buffered, i. This is the “active low” input terminal which receives a signal for writing transmit data and control words from the Interfacee into the