资料介绍
嵌入式系统 ARM
Advanced RISC Machines
The ARM Instruction Set
The ARM Instruction Set - ARM University Program - V1.0 1
Processor Modes
* The ARM has six operating modes:
User (unprivileged mode under which most tasks run)
FIQ (entered when a high priority (fast) interrupt is raised)
IRQ (entered when a low priority (normal) interrupt is raised)
Supervisor (entered on reset and when a Software Interrupt instruction is
executed)
Abort (used to handle memory access violations)
Undef (used to handle undefined instructions)
* ARM Architecture Version 4 adds a seventh mode:
System
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