July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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60 CHAPTER 2 Instruction Sets
2.2.1 Processor and Memory Organization
Different ver sions of theARM architecture are identified by different numbers. ARM7
is a von Neumann architecture machine, while ARM9 uses a Harvard architecture.
However, this difference is invisible to the assembly language programmer, except
for possible performance differences.
The ARM architecture supports two basic types of data:
■ The standard ARM word is 32 bits long.
■ The word may be divided into four 8-bit bytes.
ARM7 allows addresses up to 32 bits long.An address refers to a byte,not a word.
Therefore, the word 0 in the ARM address space is at location 0, the word 1 is
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