chapter  5
INTRODUCTION TO THE ARM M
ICROPROCESSOR
Pages 7

The Advanced RISC Machine (ARM) microprocessor is arguably the world’s most popular processor for embedded applications. It can be found in applications ranging from simple street light sensors to ink-jet printers to life-critical heart monitors. The simplicity of the ARM design is an important reason for its success. A simpler processor is easy to use and frequently has faster performance. Of equal importance, a simpler processor requires less power and can therefore run from batteries. ARM has all these features and is used in many modern products, including the following:

Acorn Computers Limited started development of the ARM processor in 1983. Acorn was enjoying the success of its 8-bit 6502-based microprocessor called the BBC (British Broadcasting Corporation) micro. The BBC micro was used widely in educational institutions

Cell phones Disk drives

PDAs Medical devices

Digital cameras Automobile navigation systems

Ink and laser printers Smart cards

Switches and routers Modems

Wireless

throughout the United Kingdom. It was also a popular processor with researchers and hobbyists. However, it was an 8-bit processor, so it had many limitations. In looking for the replacement for the BBC micro, the 32-bit ARM architecture was born. The acronym ARM was formed originally from the phrase Acorn RISC Machine.