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Programmer’s Model
ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 2-2
ID013010 Non-Confidential, Unrestricted Access
2.1 About the programmer’s model
The processor implements the ARMv7-R architecture that provides:
• the 32-bit ARM instruction set
• the extended Thumb instruction set introduced in ARMv6T2, that uses Thumb-2
technology to provide a wide range of 32-bit instructions.
For more information on the ARM and Thumb instruction sets, see the ARM Architecture
Reference Manual. This chapter describes some of the main features of the architecture but, for
a complete description, see the ARM Architecture Reference Manual.
This chapter also makes reference to older versions of the ARM architecture that the processor
does not implement. These references are included to contrast the behavior of the Cortex-R4
processor with other processors you might have used that implement an older version of the
architecture.