briefly discuss all the cpu registers

It is used to store data and instructions temporary. CPU contains a number of registers. This article discusses about the RISC and CISC architecture with suitable diagrams. Each bit of the flag register encompasses a flag or alarm, such that the bit value indicates if a specified condition was encountered while executing a certain set of instructions. The main and the basic difference between the register and memory is that the register is the holds the data that CPU is currently computing whereas, the memory holds program instruction and data that the program requires for execution. It is a special purpose register with size one byte or two bytes. Each register has a predefined function. Intel assembly has 8 general purpose 32-bit registers: eax, ebx, ecx, edx, esi, edi, ebp, esp. These are CS, DS, ES and SS. These registers are used with IP register or index registers DI and SI. The new registers are named r8 through r15. Registers frequently hold pointers which reference memory. Segment is block of memory. Each bit of the flag register constitutes a flag (or alarm), such that the bit value indicates if a specified condition was encountered while executing an instruction. A register is the only place where math can be done (addition, subtraction, etc). The current instruction is finished. This is a pivotal chapter. Types and functions of Computer Registers. The instruction is a binary word or code that defines a specific operation to be performed. A storage class specifier in C language is used to define variables, functions, and parameters. CONTENT: - 31 pages - 6 questions LEARNING TIME: - 60 minutes The intent of this module is to present all CPU12 instructions to better prepare you to write short routines in assembly language. Register. There are various types of computer registers… Such as, Data Register. 2. assigned. When the CPU fetches an instruction from memory, it is temporarily stored in the IR. Below we see a simplified diagram describing the overall architecture of a CPU. This step brings the instruction into the instruction register, a circuit that holds the instruction so that it can be decoded and executed. The 2 major reasons are that registers are faster than memory, the more data that can be kept internaly in the CPU the faster the program wil run. 8086/8088MP INSTRUCTOR: ABDULMUTTALIB A. H. ALDOURI 3 Memory The memory in a computer system is of two fundamental types: Main Memory: used to store information for immediate access by the CPU. These are four segment registers. 2. - Discuss jump and subroutine calls. A register is a piece of very expensive and very fast memory that can be found inside your CPU. A register file is the collective name for the registers inside the CPU. Memory Address Register. Accumulator Register. Flag Register(FR): The Flag register is used to indicate occurrence of a certain condition during an operation of the CPU. The result consists of both a data word, which may be stored in a register or memory, and status information that is typically stored in a special, internal CPU register reserved for this purpose. It is a unique purpose register with size one byte or two bytes. These registers are pushed onto the stack . The control register has bits written by the host to issue commands or to change settings of the device such as parity checking, ... For devices that transfer large quantities of data ( such as disk controllers ), it is wasteful to tie up the CPU transferring data in and out of registers one byte at a time. In 16-bit mode, the register is identified by its two-letter abbreviation from the list above. From the assembly language programming point of view, this chapter discusses the 80x86 register sets, the 80x86 mem-ory addressing modes, and composite data types. This is called Interrupt Lattency. When BASEPRI register is zero, all interrupts are allowed and the BASEPRI register is not active. We said that processors are either loading or storing a value into a register or from a register into memory, or doing some operation on values in registers. The CPU does not directly access the secondary memory, instead it always relies on the primary memory. Closely … Feedback: 1.2.1 4. Auto, extern, register, static are the four different storage classes in a C program. So, for this purpose, there are several different classes of CPU registers which works in coordination with the computer memory to run operations efficiently. For example, 'EAX' is the accumulator register as a 32-bit value. Each register is a special spot in the CPU where a single value is stored. The other reason is that registers are easier for a compiler to use. discuss Arithmetic instructions Data transfer instructions Decision making (conditional branching) instructions Jump (unconditional branching) instructions It is important to keep in mind that assembly language is a low-level language, so instructions in assembly language are closely related to their 32-bit representation in machine language. Computers use two types of storage: Primary storage and secondary storage. What are CPU registers? Registers can be read and written at high speed as they are inside the CPU. It constitutes the physical heart of the entire computer system; to it is linked various peripheral equipment, including input/output devices and auxiliary storage units. Register is a small high-speed memory inside CPU. Address or segment registers are used to store the address of memory blocks of the instruction being executed. Register size determines how much information it can store. To execute a complete instruction we need to take help of these basic operations and we need to execute these operation in some particular order. 2. Though accessing instructions from RAM is comparatively faster with hard drive, it still isn’t enough for CPU. The CPU contains of small memory areas:called registers,which store data and instructions while the CPU processes them. Major parts of a CPU []. Another type of register is the accumulator, which is responsible for storing the next values that will be processed by the CPU. There are overall two main types of storage: - Primary Storage ( memory ): This type of storage is primarily used to store information temporarily. Assume that all three programs are 100% CPU bound, do not block during execution, and do not change CPUs once . Discuss different address or segment registers? Today most PC`s have 32-bit registers,mean the CPU can process four bytes data at one time.Register sizes are rapidly growing to 64 bits. Intel and AMD are the two most popular CPU manufacturers for desktops, laptops, and servers, while Apple, NVIDIA, and Qualcomm are big smartphone and tablet CPU makers. RISC is a CPU design strategy based on the insight that simplified instruction set gives higher performance when combined with a microprocessor architecture which has the ability to execute the instructions by using some microprocessor cycles per instruction. A processor register (CPU register) is one of a small set of data holding places that are part of the computer processor. Transfer of data between CPU registers. The lower 32 bits, 16 bits, and 8 bits of each register are directly addressable in operands. The size of each register is two bytes. Is really a counter and a register file is the collective name for the registers inside the CPU 's... Instruction from memory, instead it always relies on the Primary memory and unit... 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