Programmers Model
ARM DUI 0447J
Copyright © 2009-2014, ARM. All rights reserved.
4-2
ID052914
Non-Confidential
4.1
About this programmers model
The following information applies to the
Motherboard Express µATX
registers:
•
The base address is not fixed, and can be different for any particular system
implementation. The offset of each register from the base address is fixed.
•
Do not attempt to access reserved or unused address locations. Attempting to access these
locations can result in Unpredictable behavior.
•
Unless otherwise stated in the accompanying text:
—
Do not modify undefined register bits.
—
Ignore undefined register bits on reads.
—
All register bits are reset to a logic 0 by a system or power-on reset.
•
Access type in
Table 4-3 on page 4-8
is described as follows:
RW
Read and write.
RO
Read only.
WO
Write only.