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IntroductionTable of Contents1 Introduction................................................................................................................ 41.1 The ARM architecture......................................................................................... 41.2 ARM development tools...................................................................................... 41.3 References and Further Reading ....................................................................... 42 ARM architecture features ........................................................................................ 52.1 ARM architecture versions.................................................................................. 52.2 Architecture ARMv7-A extensions...................................................................... 52.3 Programmer’s model .......................................................................................... 62.4 Debug ................................................................................................................. 83 Power Architecture (PPC) and ARM compared ...................................................... 93.1 Programmer’s model .......................................................................................... 93.2 System control and configuration registers....................................................... 153.3 Exceptions and interrupts ................................................................................. 153.4 Memory............................................................................................................. 183.5 Debug ............................................................................................................... 223.6 Power management.......................................................................................... 234 Migrating a software application............................................................................ 254.1 General considerations..................................................................................... 254.2 Tools configuration ........................................................................................... 274.3 Operating system.............................................................................................. 274.4 Startup .............................................................................................................. 274.5 Handling interrupts and exceptions .................................................................. 284.6 Timing and delays............................................................................................. 304.7 Power Management.......................................................................................... 304.8 Semaphores etc................................................................................................ 314.9 Accessing peripherals....................................................................................... 324.10 C programming................................................................................................. 325 A porting checklist................................................................................................... 33Application Note 245 Copyright © 2012 ARM Limited. All rights reserved. 3ARM DAI 0245B