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Features of 8251 USART – 8251 Programmable Communication Interface – Microprocessor


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Now when the Microprocessor they communicates with the peripheral devices they need to transfer the data or receive the data from the peripheral devices so here if we have a Microprocessor and a peripheral device peripheral devices they can be input/output devices so when the Microprocessor it communicates with the peripheral devices it is either going to transfer the data or it is going to receive the data now in these peripheral devices they are located at some remote location so the microprocessor it has to transfer or receive the data over the long distances okay now this data it can be a an 8-bit data or it can be 16-bit data or it can be 32-bit data or more so this 8-bit 16-bit or 32-bit data it has to transfer over a long distance to the peripheral devices also the peripheral devices if they are sending the data then also that data has to be transferred so if such longer data because it’s a large amount of data eight bits have to be transferred so these eight bits they can be transferred either in parallel transmission or through the serial transmission but no transmission means that all the eight bits they are transferred at the same time here we are having a bitch so all the eight bits they will be transmitted at the same time so this type of transmission is called parallel transmission whereas the second type that is the serial transmission in serial transmission only single line is used and one after the other the eight bits are transmitted okay here all the eight bits are transmitted at the same here in Syrian transmission only a single line is there and one after the other all the eight bits will be transmitted okay so there are two types of transmission now the microprocessor when it is transmitting the data over a long distance it will play for serial transmission because parallel transmission that many number of lines it has to be connected between the microprocessor and the peripheral device and there is a long distance between these two so the serial transmission it is preferred when the data is to be transmitted over a long distance okay now also in serial transmission because transmission is taking place over a long distance so there are chances that errors can occur okay errors means that the transmitted data and the data received by the peripheral device if they are different then an error has occurred so there are chances that error can occur also the microprocessor when it receives the data it will compute all the data in parallel form okay so when it has to transmit the data it has to convert the parallel data into the serial data also when it will receive the data it will receive it in the form of serial ok serial data form so it has to convert it into the pandal form so that it can process that data so every time when it is transmitting the data it has to perform the parallel to serial conversion and also when it is receiving the data it has to perform the serial to parallel conversion okay so conversion also it has to perform okay so in all this when the microprocessor it is transmitting the data over a long distances the problems are occurring what problem is that it has to do the conversions also errors can occur also the microprocessor it is busy in doing all these tasks okay so the in place of using the microprocessor we can use an interfacing device in between this we can use an interfacing device which will perform all these conversions and all the tasks related to the transmitting and receiving of the data okay this is called an interfacing device because it is acting in between the microprocessor and the peripheral device it is acting as a communication link between the two okay so for this purpose intel has developed a device which is known as programmable communication interface which act as an interfacing device between the microprocessor and the peripheral devices which are communicating with each of them that is why the communication board is used also interface because interface is the word given to a device which is act as a communication link between two components so it is acting as a communication link between microprocessor and peripheral devices that is why it is called interface communication programmable because we can write programs here we can write the instructions we can write the Montford status word in it so it can be programmed that is why it is called programmable communication interface okay and the IC number for this is a 2 v 1 so let us study the 8 to 5 for programmable communication interface device in details into pfeiffer which is known as programmable communication that is P C I so this 8 to 5 fun it was developed by the Intel for as a communication interface for the microprocessor it can be used for all the families of the microprocessor like a zero eight zero eight zero eight five eight six eight eight so it is compatible with all the microprocessor family so the first feature of eight-to-five phone is that it is compatible with the extended range of Intel micro processors such as H 0 8 0 8 5 8 6 & 8 8 now this 8 to 5 one that is programmable communication interface it is also known as universal synchronous asynchronous receiver transmitter this is called Universal synchronous asynchronous receiver transmitter because this device it is acting as a receiver also and as a transmitter also it is receiving the data also and transmitting the data also synchronous asynchronous because in the serial transmission there are two types of serial transmission asynchronous and synchronous so it is it can act as both synchronous and asynchronous that is why it is known as universal synchronous asynchronous receiver transmitter if we take its short form will be mu s a R T so it is popularly known as us a R T usart okay that is the universal synchronous asynchronous receiver and transmitter so the second feature of this eight-to-five phone is that it provides you both asynchronous and synchronous data transmission okay now because it is transmitting the data in both the forms asynchronous and synchronous so synchronous data bit characters it can be 5 to 8 bit characters and also for the asynchronous it can transmit 5 to 8 bit characters okay next feature of 8 to 5 phone is that when we talk about the senior transmission then it can be half duplex or full duplex okay so this 8 to 5 fun it is a full duplex double powerful transmitter and receiver it is acting as Bo transmitter and receiver so there will be buffer whittles transmitting and receiving the data means it is acting in both the direction so bi-directional buffer will be there so it is having double buffered transmitter and receiver which is full duplex okay now when data is transmitted or received over long distances so the 8 to 5 and it should keep in mind that errors should not be produced so one of the feature of a 2 – is that it is capable of detecting the errors like parity error overrun and the framing errors so all these errors can also be detected so the data is transmitted and received at a high accuracy by the 8 to 5 point communication interface you the e25 on I see this I see has input and output pins so the input and output pins of the e25 fund they are TTL compatible okay also it is available in 28 pin VIP package so this ica to 510 is having 28 pins okay so these are the features of this eight to five fun programmable communication interface if we talk about its function then the eight to five fun so this 8 to 5 which is known as the programmable communication interface also and also the universal synchronous asynchronous receiver transmitter it is universally accepted as the receiver and transmitter by all the programmers all the programs they are you you they are going to use this as the communication interface so what this USA RT does it accepts the data so this USA Artie it is accepting the data characters from the CPU in the parallel format and converting them into the container serial data stream for the transmission so it is performing the parallel to the serial data conversion when it is transfer transmitting the data now when it is receiving the data then what it is going to do you so simultaneously this USA RT it is going to receive the serial data streams and convert them into into the fabula for the CPU okay so at the time of receiving it is going to perform the serial to parallel conversion if we describe this functioning in the form of a diagram here we will have the CPU or we can say the microprocessor in between it we will have the new SAR T here we will have the peripheral device so you SAR T when the CPU it is transmitting the data it will transmit it in the form of serial inside it it is having the data in the form of parallel okay so this parallel data will be given to the u.s. ERT it is going to convert it into the serial data and transmit it to the peripheral device so it is for performing the parallel to serial serial conversion at the time of transmitting when it is receiving it will receive it in the form of serial data and it is going to transmit the data to the microprocessor in the form of parallel data okay so here it is performing the parallel to serial conversion and at the time of receiving it is performing the serial to parallel conversion so in this form in the form of diagram we can describe the functioning of the Universal synchronous asynchronous receiver and transmitter so these are some of the features of this USA r/t a25 one let’s summarize these features it can act as it is compatible with all the type of micro processors a zero eight zero eight six eight five eight eight advanced microprocessor also as that is where it is used to as an Universal it is accepted as an Universal receiver and transmitter it is available and twenty eight pin IC a two five one also all the input and output pins they are TTL compatible it can it can perform serial transmission serial to parallel conversion also it can done and it can also perform the parallel to serial conversion and both synchronous and asynchronous data transmission can be done by it so these were the features of the a two five one programmable communication interface which is also known as you as a RT so I hope that this topic is clear to you thank you

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