在v4T架构的基础上，A RM又推出了 T humb指令集架构（I S A），这是一个16 位的I S A，可以改进代码密度（一般约为 30%）。Cor tex-M3使用Thumb-2 ISA 来实现A R M v7-M，A R M v7-M是原始 T h u mb的一个超集，其中包括新的16位 和32位指令。这些新增功能使得系统不 再需要原始ARM ISA，这样Cor tex-M3 便可始终以一种模式（Thumb-2）执行， 而不像ARM7那样需要在ARM/Thumb这 两种模式下切换。
This manual documents the Microcontroller profile of version 7 of the ARM® Architecture, the ARMv7-M architecture profile. For short definitions of all the ARMv7 profiles see About the ARMv7 architecture, and architecture profiles on page A1-32.
This ARM Architecture Reference Manual is protected by copyright and the practice or implementation of the information herein may be protected by one or more patents or pending applications. No part of this ARM Architecture Reference Manual may be r
The ARM architecture has evolved through several major revisions to a point where it supports implementations across a wide spectrum of performance points, with over a billion parts per annum being produced. The latest version (ARMv7) has seen the d
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