ARM - Acorn Risc Machine ARM is a RISC processor with the following features Load-store architecture 16 registers, each 32-bits wide Three-operand instructions, 32-bits wide At each clock cycle a new instruction is issued Low energy consumption (W/MIPS) It is designed by ARM Ltd. and licensed to manufacturers ARM7: nommu, very widespread as a microcontroller DEC, then Intel: StrongARM (now dead) Intel, then Marvell: Xscale: 80200, PXA255, PXA270, IXP425, ... Cirrus Logic: EP93xx: 9302, 9315, ... Freescale (now NXP): iMX1, iMX21, iMX27, iMX31, ..., iMX7, ... Atmel: AT91SAM: many flavours ... many more ... http://en.wikipedia.org/wiki/ARM_architecture