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This chapter describes the THUMB instruction set. Format Summary. 5-2. Opcode Summary. 5-3. 5.1. Format 1: move shifted register. 5-5. 5.2. Format 2: add/ 28 Mar 2016 One instruction in ARM instruction set is 32-bit, while in Thumb instruction set, it's 16-bit, which So we defined the CPSR_T_MASK 1u 5. 5 Oct 2017 ARM, previously Advanced RISC Machine, originally Acorn RISC Machine, is a family of The Thumb version supports a variable-length instruction set that provides both .. Although the architecture profiles were first defined for ARMv7, ARM 24 Sep 2003 To reduce memory requirements and, thereby, cost, Advanced RISC Machines (ARM) created the Thumb instruction set as an option for their1 Jul 2016 The ARM processor has 2 instruction sets, the traditional ARM set, where the This is the meaning of Thumb instructions are 16 bits long,and have a Home » Overview of the ARM Architecture » ARM and Thumb instruction set A few instructions are also defined that can load or store 64-bit doubleword The Thumb instruction set supports load and storing registers, or LDR and STR. . Special forms of LDR, STR, ADD, and SUB are defined to operate relative to The Thumb instruction set is a subset of the most commonly used 32-bit ARM instructions. Thumb instructions are each 16 bits long, and have a corresponding 32-bit ARM instruction that has the same effect on the processor model. The Thumb instruction set is valuable not only to reduce the size and cost of code Special forms of LDR, STR, ADD, and SUB are defined to operate relative to