ARM IM-AD1 - Manual (Page 68)

Reference Design Example
4-22 Copyright © 2001-2003. All rights reserved. ARM DUI 0163B
4.8.5 Data direction
The GPIO_DIRN location is used to set the direction of each GPIO pin as follows:
1 = pin is an output
0 = pin is an input (default).
Figure 4-6 shows the data direction control for one GPIO bit.
Figure 4-6 GPIO direction control (1 bit)
Data direction register
Data register
Read data output
Read data input
Pin/pad