MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -RS232C has been used for long and has a few disadvantages like limited speed of communication, high-voltage level signaling and big-size communication adapters.

Detailed explanation-2: -An active-low signal at this pin shows that the 8251 is now ready to accept the data from the processor. RTS: It stands for the request to send. A low signal shows an assertion for data transmission.

Detailed explanation-3: -Half-Duplex is the data transmission mode in which the data can flow in both directions but in one direction at a time. It is also referred to as Semi-Duplex. In other words, each station can both transmit and receive the data but not at the same time.

Detailed explanation-4: -Data Output command-A data output command causes the interface to respond by transferring data from the bus into one of its registers.

Detailed explanation-5: -A USART is also called a programmable communications interface (PCI). When information is to be sent by 8086 over long distances, it is economical to send it on a single line. The 8086 has to convert parallel data to serial data and then output it. Thus lot of microprocessor time is required for such a conversion.