what are registers in assembly?
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a register is a small bit of memory that sits inside the CPU. and is used by assembly language to perform various tasks. ... Well, you have general purpose registers, then you have registers which have special usage (for example, the program counter registers), and you have various others (memory/segment registers, SSE).
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Main difference between auto and register is that variable declared as auto is stored in memory whereas variable declared as register is stored in CPU register. Since the variable is stored in CPU register, it takes very less time to access that variable.
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['Control Unit.', 'I/O Units.', 'Arithmetic Logic Unit (ALU)', 'Registers.', 'Cache.']
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“The difference between the memory stack and the register stack is : ... The operation of the memory stack is exactly similar to the operation of the register stack but the memory stack is implemented using computer memory instead of the CPU register array.
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Machine code is binary (1's and 0's) code that can be executed directly by the CPU. ... Assembly code is plain-text and (somewhat) human read-able source code that mostly has a direct 1:1 analog with machine instructions. This is accomplished using mnemonics for the actual instructions, registers, or other resources.
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That's MIPS Assembly, one that I am not so experienced with, due to lack of hardware. But as far as I know, the ADD is adding a value, which can be an immediate, while the ADDI is explicitly adding an immediate. The difference should be, as you can see, that the immediate value in the first one is limited to 5 bits.
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popa restores the general registers to their values before a previous pusha was executed. DI is the first register popped. The eight 32-bit registers are popped by popad. However, the ESP value is not loaded into ESP, it is discarded.
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MOV, MOVS (immediate) Move (immediate) writes an immediate value to the destination register. If the destination register is not the PC, the MOVS variant of the instruction updates the condition flags based on the result.
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['Central processing unit.', 'Rack or mounting.', 'Input assembly.', 'Output assembly.', 'Power supply.', 'Programming unit.']
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The DMA controller then provides addresses and read/write control lines to the system memory. Each time a byte of data is ready to be transferred between the peripheral device and memory, the DMA controller increments its internal address register until the full block of data is transferred.
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Direct: The effective address of the operand in memory is part of the instruction. Indirect: The instruction contains a memory address, which contains the effective address of the operand in memory. Register: The instruction contains the address of the register where the operand is stored.
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Timer Control Register (TCON): TCON is another register used to control operations of counter and timers in microcontrollers. It is an 8-bit register wherein four upper bits are responsible for timers and counters and lower bits are responsible for interrupts.
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['Input Unit.', 'Output Unit.', 'Storage Unit.', 'Central Processing Unit (CPU)', 'Arithmetic and Logic Unit (ALU)', 'Control Unit.']
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The Data Pointer (DPTR) is the 8051's only user-accessible 16-bit (2-byte) register. The Accumulator, R0–R7 registers and B register are 1-byte value registers. DPTR is meant for pointing to data. It is used by the 8051 to access external memory using the address indicated by DPTR.
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Nearly all processor registers have sizes that are powers of two, 32 or 64 being very common. Powers of two occur in a range of other places as well. For many disk drives, at least one of the sector size, number of sectors per track, and number of tracks per surface is a power of two.
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An assembler is a program that converts assembly language into machine code. It takes the basic commands and operations from assembly code and converts them into binary code that can be recognized by a specific type of processor. Assemblers are similar to compilers in that they produce executable code.
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These are commonly divided into data registers and address registers. Status Registers hold truth values to determine if instruction should be executed or not. Floating-Point Registers store floating point numbers. Special-Purpose Registers include the program counter, hold program state, and the status register.