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ARM is a family of reduced instruction set computer (RISC) instruction set architectures for computer processors, configured for various environments. Arm and CPSR. Instruction set defines the operations that can change the state. ARM instructions are all 32 bit long are all 32-bit long (except for Thumb mode) 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 The ARM Instruction Set - ARM University Program - V1.0. 3. * ARM has 37 registers in total, all of which are 32-bits long. • 1 dedicated program counter.and also 16 bit data types on ARM Architecture v4. Flexible multiple register load and store instructions. Instruction set extension via coprocessors. The ARM The ARM has a load store architecture, meaning that all arithmetic and logical instructions take only register operands. They cannot directly operate on ARM Instruction Sets · 1. Data processing instructions: This instruction is responsible for internal operations that are specifically registered for the co- In ARM state, all instructions are conditionally executed according to the state of the. CPSR condition codes and the instruction's condition field.