ARM（Advanced RISC Machine）採用的是RISC精簡指令集，Load/Store架構，所有指令必須載入到寄存器才能進行運算。7種工作模式。31個通用寄存器，6個狀態寄存器。大小端可配置。 ...
ARM（Advanced RISC Machine）採用的是RISC精簡指令集，Load/Store架構，所有指令必須載入到寄存器才能進行運算。7種工作模式。31個通用寄存器，6個狀態寄存器。大小端可配置。
Processor Architecture = Instruction Set + Programmer’s model
ARM Architecture profiles
Programmer’s Model
Data Sizes and Instruction Sets
Processor Modes
The ARM Register Set
Program Status Registers
Data alignment
Exception Handling
Instruction Sets
ARM Instruction Set
Thumb Instruction Set
Thumb-2 Instruction Set
Thumb 2 Performance / Density
Popular Processor Cores
ARM926EJ-S Processor
ARM Cortex-M3 Processor
ARM NAMING CONVENTIONS
ARM processors have had a relatively consistent naming convention since their start, but thenaming convention can be a little confusing. You must understand the difference between aprocessor and an architecture.
An architecture is a design.
A processor is a device.
An architecture has several processors, all of them using the same basic features, but each processorhas a slightly different configuration.
How to Tell What Processor You Are Dealing With
Classic ARMcores have the name ARM{x}{labels}, with later variants adopting a name of the form ARM{x}{y}{z}{labels}. Since 2004, all ARM cores have been released under the Cortex brand and have names inthe form Cortex-{x}{y}.
The first cores, known as classic processors, use the naming conventions listed in Table 1-1. The firstnumber (x) corresponds to the core version. The second and third numbers (y and z) correspond tothe cache/MMU/MPU information and cache size, respectively.
TABLE 1-1: ARM Processor Numbering
The letters after a processor name are called the label and indicate what optional extensions areavailable on the processor, as shown in Table 1-2.
TABLE 1-2: ARM Label Attributes
For newer cores, known as Cortex, the naming convention is different, and easier to follow. Thereare three Cortex families: Cortex-A, Cortex-R, and Cortex-M.
Which architecture is my processor?
References
1. ARM Architecture Overview
2. Professional-Embedded-ARM-Development
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