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Micro-architecture is the structural design of a microprocessor. This computer organization leverages a method where the instruction set architecture holds a built-in processor. Engineers and hardware scientists implement instruction set architecture (ISA) with various micro-architectures that vary because of changing technology. Instruction Length Affected by Memory size/organization, register numbers, bus structure, etc Flexibility vs. Implementation ComplexityFlexibility vs. Implementation Complexity Memory-transfer consideration Fixed vs. non-fixed instructions Instruction Set The collection of different instructions CPU can understand and execute Different instructions Technopaedia — Instruction Set Architecture (ISA) The ISA is one of the earliest and most important programming abstractions. Jon Stokes - Apr 13, 2008 8:40 pm UTC Download version 3.1b 2021-09-14. The Power Instruction Set Architecture (ISA) Version is a specification that describes the architecture used by POWER processors. It defines the instructions the processor executes. It is comprised of three books and a set of appendices. Book I. Arm is opening its instruction set architecture for Cortex M cores. By allowing licensees to build their own custom instructions, developers are able to accelerate specialized workloads. 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. An instruction set, or instruction set architecture (ISA), is a list of all the commands ( instructions ), with all their variations, that a processor can execute. Instructions include: Arithmetic such as add and subtract. Logic instructions such as and, or, and not. Data instructions such as move, input, output, load, and store. Examples -. 1. This simple subtract instruction subtracts a value stored in register r2 from a value stored in register r1. The result is stored in register r0. PRE. r0 = 0x00000000 ; As this register is a register to hold the output, that's why it is empty before execution. r1 = 0x000000002 ; register r1 holds the value '2'. The ARM instruction set also has some decidedly non-RISC features. The most well-known is predicated instructions, which execute conditionally based on the state of one of the condition registers. In a typical implementation, they execute anyway, but the results are stored only if the condition codes are matched. Consider a typical pipelined CPU. Information on the A64 instruction set, used in AArch64. 2.2 Classifying Instruction Set Architectures 103 puters shipping today, keeps all operands in memory and is called a memory-memory architecture. Some instruction set architectures have more registers than a single accumulator, but place restrictions on uses of these special registers. Such an architecture is sometimes called an extended MSP430 Instruction Set Architecture ! MSP430 CPU specifically designed to allow the use of modern programming techniques, such as: - the computation of jump addresses - data processing in tables - use of high-level languages such as C. 64