MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -PIC16F877A Serial Communication Tutorial USART is a two-wire communication system in which the data flow serially. USART is also a full-duplex communication, which means you can send and receive data at the same time which can be used to communicate with peripheral devices, such as CRT terminals and personal computers.

Detailed explanation-2: -The UART interface consists of two pins: the Rx and Tx pin. The Rx pin is used to receive data. The Tx pin is used to transmit data. When two devices are connected using a UART, the Rx pin of one device is connected to the Tx pin of the second device.

Detailed explanation-3: -A serial bus consists of just two wires-one for sending data and another for receiving. As such, serial devices should have two serial pins: the receiver, RX, and the transmitter, TX. It’s important to note that those RX and TX labels are with respect to the device itself.

Detailed explanation-4: -The DB9 connector is an analog connector mainly used for serial connections for the asynchronous transmission of data as provided by RS-232 standard. Here is the pinout of PC DB9 connector.