OUT Output Instruction

This instruction is used  send data byte  stored in the accumulator  to the  output  port  whose  address  specified in the instruction. The instruction format is

OUT 8 bit  port address                [ output  port  address ] - A]

Example: How  to send  data byte sorted  in register B  to the  output port identified by  8 bit  address (00H)?

Solution : OUT  instruction is used to send data  byte  stored  in the  accumulator to the  specified  output  port.  Hence data  strode in register B will  have to  copied into  accumulator  first  using MOV instruction. Following  instruction  are used to  perform  the given task.

MOV  A, B

OUT 00H

Hardware and other  details  of interfacing  input output  ports are explained in  chapter 7.