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The main difference between these two states is the instruction set, where instructions in ARM state are always 32-bit, and instructions in Thumb state are 16-bit (but can be 32-bit). Home » Overview of the ARM Architecture » ARM and Thumb instruction set to determine whether the code being branched to is Thumb code or ARM code. ARM Instruction Set. Computer Organization and Assembly Languages p. g z. y g g. Yung-Yu Chuang with slides by Peng-Sheng Chen 22 Aug 2008 Flexible multiple register load and store instructions. ? Instruction set Optimized for code density from C code. – Improved performance form narrow memory. – Subset of the functionality of the ARM instruction set. ? Core has The ARM Instruction Set - ARM University Program - V1.0. 1. The ARM Instruction . Specific instructions to allow access to CPSR and SPSR. * Note : When in a . For example to add two numbers and set the condition flags: – ADDS r0,r1,r2. Assembly Language > Overview of the ARM architecture > Instruction set overview Instructions are stored word-aligned, so the least significant two bits of The original (and subsequent) ARM implementation was hardwired set added 16-bit instructions and increased code density.Jin-Fu Li, EE, NCU. 2. ? Registers, Memory Access, and Data Transfer. ? Arithmetic and Logic Instructions. ? Branch Instructions. ? Assembly Language. An Instruction Set Architecture (ISA) is part of the abstract model of a computer. It defines how software controls the CPU. The Arm ISA family allows developers to write software and firmware that conforms to the Arm specifications, secure in the knowledge that any Arm-based processor will execute it in the same way. instructions should not be used, as their action may change in future ARM . condition codes. Code. Suffix. Flags. Meaning. 0000. EQ. Z set equal. 0001. NE.