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The alternate function of 8051 port 2 is :

  • A.Input/output data \((D_{0} - D_{7})\)
  • B.Sending higher order address \((A_{8} - A_{15})\)
  • C.Sending lower order address \((A_{0} - A_{7})\)
  • D.Serial input/output

Answer: B

The alternate function of port 2 is sending the higher order address (A8-A15).

When the 8051 accesses external memory, port 2 outputs the upper byte of the 16-bit address, while port 0 carries the lower byte multiplexed with data.

The data byte D0-D7 and the lower address A0-A7 are the alternate functions of port 0. Serial input and output (RXD, TXD) are alternate functions of port 3.

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