ARM VERSION 1.2 - page 19

Writing ARM and Thumb Assembly Language
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Single register load and store instructions
These instructions load or store the value of a si ngle register from or to memory. They
can load or store a 32-bit word or an 8-bit unsigned byte. In ARM architecture v4 and
above they can also load or store a 16-bit unsigned halfword, or load and sign extend a
16-bit halfword or an 8-bit byte.
Multiple register load and store instructions
These instructions load or store any subset of the general-purpose registers from or to
memory. Refer to Load and store multiple register instructions on page2-39 for a
detailed description of these instructions.
Status register access instructions
These instructions move the contents of the CPSR or an SPSR to or from a
general-purpose register.
Semaphore instructions
These instructions load and alter a memory semaphore.
Coprocessor instructions
These instructions support a general way to extend the ARM architecture.