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The Program Counter (PC) and Stack Pointer (SP) are 16-bit registers in certain architectures, like the x86 architecture in its real mode, because they are designed to address memory locations directly within a 64KB address space. Using 16 bits allows these registers to hold values ranging from 0 to 65,535, which corresponds to the maximum addressable memory in that mode. This design choice was influenced by the historical context of early computing when memory sizes were smaller and 16-bit processing was common. As architectures evolved, larger registers and addressing modes were introduced to accommodate greater memory requirements.
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Which are the various 16-bit registers in Intel 8085?
The various 16-bit registers on the 8085 are BC, DE, HL, SP, PC.
Why are programme counter and stack pointer register 16 bit registers?
The program counter (PC) and stack pointer (SP) registers are 16-bit registers in the 8085 and in the 8086/8088 because that is how Intel designed the processors.
Why PC and Sp are 16 bit counter in 8085 microproceser?
Because Intel designed it that way. The 8085 was designed as a 8 bit computer in a 16 bit address space. This means that the PC (Program Counter) and SP (Stack Pointer) should be 16 bits in size.
Which CPU register holds address for memory?
The program counter (PC) and the stack pointer (SP).
How many registers are there in an 8085 microprocessor?
Accumulator or A register is an 8-bit register used for arithmetic, logic, I/O and load/store operations. Flag is an 8-bit register containing 5 1-bit flags: * Sign - set if the most significant bit of the result is set. * Zero - set if the result is zero. * Auxiliary carry - set if there was a carry out from bit 3 to bit 4 of the result. * Parity - set if the parity (the number of set bits in the result) is even. * Carry - set if there was a carry during addition, or borrow during subtraction/comparison. General registers: * 8-bit B and 8-bit C registers can be used as one 16-bit BC register pair. When used as a pair the C register contains low-order byte. Some instructions may use BC register as a data pointer. * 8-bit D and 8-bit E registers can be used as one 16-bit DE register pair. When used as a pair the E register contains low-order byte. Some instructions may use DE register as a data pointer. * 8-bit H and 8-bit L registers can be used as one 16-bit HL register pair. When used as a pair the L register contains low-order byte. HL register usually contains a data pointer used to reference memory addresses. Stack pointer is a 16 bit register. This register is always incremented/decremented by 2. Program counter is a 16-bit register.
How much space did the Intel 8080 microprocessor have?
The stack size of Intel's 8085 microprocessor is theoretically 64 kb, but the real limit is a function of memory and program architecture and layout. The stack pointer is 16 bits, but that is not the same as stack size.
What is the size of flag register?
All of the 8086/8088 registers, AX, BX, CX, DX, SP, BP, SI, DI, CS, DS, SS, ES, IP, and FLAGS, are 16 bit registers. The AX, BX, CX, and DX registers may also be viewed as 8 eight bit registers AH/AL, BH/BL, CH/CL, and DH/DL.
What 9S12DP256's internal registers are used to generate bus signals only?
PC (Program Counter) IX (Index Register X) IY (Index Register Y) SP (Stack Pointer)
List the16-bit general purpose registers in amd64 architectures?
All 16 of the x64 architecture's G.P. registers can be addressed as 16-bit registers, using the names AX, BX, CX, DX, SI, DI, BP, SP, R8w, R9w, R10w, R11w, R12w, R13w, R14w, and R15w. Using SP as a G.P. register is not a good idea, however, since this will conflict with its function as the stack pointer.
What are the different registers in an 8085 microprocessor?
There are 6 general purpose Registers and Two special purpose registers: General purpose registers(8 bit basically) are B,C,D,E,H,L and SPECIAL Purpose resisters are STACK PONITER,PROGRAM COUNTER these two are 16 bit registers. If u want make general purpose registers as 16 bit registers, the combination is BC,DE,HL these are 16 bit pair registers
Why stack pointer is 16- bit register?
Program Counter( PC)stores the 16-bit memory address of the next instruction to be fetched. Stack Pointer (SP)stores the address of a memory location which is used as a stack.
Can you change the value of the sp register?
Yes you can
