Importance of TXD and RXD pins in 8051

State the importance of the TXD and RXD pins within the 8051?

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a) TXD – Transmit the data pin for the serial port within the UART mode. Clock output in the shift register mode.

b) RXD – Receive the data pin for serial port within the UART mode. Data I/O pin in the shift register mode.

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