ARM Cortex R4F User Manual Page 7

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© G.N. Khan ARM Processors/Cores – EE8205: Embedded Computer Systems Page: 7
Three Types of Instruction Sets
•ARM Instruction Set
Instructions are 32 bits wide
Original RISC (lots of parallelism)
Load/Store Architecture
Thumb Instruction Set
Subset of ARM instructions, some restrictions
Instructions are 16 bits wide (more like CISC)
Intended for compilers
Less parallelism, longer instruction sequences
but total code size is 30% smaller
•JazelleInstruction Set
Java byte codes
Hardware
Decoder
16-bit Thumb
Instruction
32-bit ARM
Instruction
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