(1)
The direction of the component is set to input.

 MAIN.C

void main(void)
{
  /* Wait until "10101010" is on the port */
  while( Byte1_GetVal() != 0xAA );
    :
}

(2)
The direction of the component is set to output.

 MAIN.C

void main(void)
{
  Byte1_PutVal(0xAA);  // "10101010" is on the port
  
  for (;;) {
  /* Invert output level of fourth pin on the port */
    Byte1_NegBit(3);
  }
}

(3)
The direction of the component is set to input/output.

 MAIN.C

void main(void)
{
  Byte1_SetDir(FALSE);  // Set input mode

  /* Wait until "11111111" is on the port */
  while( Byte1_GetVal() != 0xFF );
  
  Byte1_SetDir(TRUE);   // Set output mode

  Byte1_PutVal(0);      // Set "00000000" on the port
}