Define stack and explain stack related instructions

Define stack and explain stack related instructions
by

1 Answer

Answer :

The stack is a group of memory locations in the R/W memory thatis used  for  the  temporary  storage  of  binary  information  during  the  execution  of  the  program. The stack related instructions are PUSH & POP
by

Related questions

When a subroutine is called, the address of the instruction following the CALL instructions stored in/on the a. stack pointer b. accumulator c. program counter d. stack

Description : When a subroutine is called, the address of the instruction following the CALL instructions stored in/on the a. stack pointer b. accumulator c. program counter d. stack

Last Answer : d. stack

Explain LDA, STA and DAA instructions

Description : Explain LDA, STA and DAA instructions

Last Answer : LDA copies the data byte into accumulator from the memory location specified by the 16-bit address. STA copies the data byte from theaccumulator in the memory location specified by 16-bit address. DAA changes the contents of the accumulator from binary to 4-bit BCD digits.

Explain the purpose of the I/O instructions IN and OUT.

Description : Explain the purpose of the I/O instructions IN and OUT.

Last Answer : The IN instruction is used to move data from an I/O port into the accumulator. The OUT instruction is used to move data from the accumulator to an I/O port. The IN & OUT instructions are used only on microprocessor, which use a separate address space for interfacing.

When the RET instruction at the end of subroutine is executed, a. the information where the stack is iniatialized is transferred to the stack pointer b. the memory address of the RET instruction is transferred to the program counter c. two data bytes stored in the top two locations of the stack are transferred to the program counter d. two data bytes stored in the top two locations of the stack are transferred to the stack pointer

Description : When the RET instruction at the end of subroutine is executed, a. the information where the stack is iniatialized is transferred to the stack pointer b. the memory address of the RET instruction is ... two data bytes stored in the top two locations of the stack are transferred to the stack pointer

Last Answer : c. two data bytes stored in the top two locations of the stack are transferred to the program counter

In immediate addressing the operand is placed a. in the CPU register b. after OP code in the instruction c. in memory d. in stack

Description : In immediate addressing the operand is placed a. in the CPU register b. after OP code in the instruction c. in memory d. in stack

Last Answer : b. after OP code in the instruction

A stack pointer is a. a 16-bit register in the microprocessor that indicate the beginning of the stack memory. b. a register that decodes and executes 16-bit arithmetic expression. c. The first memory location where a subroutine address is stored. d. a register in which flag bits are stored

Description : A stack pointer is a. a 16-bit register in the microprocessor that indicate the beginning of the stack memory. b. a register that decodes and executes 16-bit arithmetic expression. c. The first memory location where a subroutine address is stored. d. a register in which flag bits are stored

Last Answer : a. a 16-bit register in the microprocessor that indicate the beginning of the stack memory.

A stack is a. an 8-bit register in the microprocessor b. a 16-bit register in the microprocessor c. a set of memory locations in R/WM reserved for storing information temporarily during the execution of computer

Description : A stack is a. an 8-bit register in the microprocessor b. a 16-bit register in the microprocessor c. a set of memory locations in R/WM reserved for storing information temporarily during the execution of computer

Last Answer : c. a set of memory locations in R/WM reserved for storing information temporarily during the execution of computer

The data in the stack is called: a. Pushing data b. Pushed c. Pulling d. None of these

Description : The data in the stack is called: a. Pushing data b. Pushed c. Pulling d. None of these

Last Answer : a. Pushing data

The structure of the stack is _______ type structure: a. First in last out b. Last in last out c. Both a & b d. None of these

Description : The structure of the stack is _______ type structure: a. First in last out b. Last in last out c. Both a & b d. None of these

Last Answer : a. First in last out

SP stand for: a. Stack pointer b. Stack pop c. Stack push d. None of these

Description : SP stand for: a. Stack pointer b. Stack pop c. Stack push d. None of these

Last Answer : a. Stack pointer

Which is the basic stack operation: a. PUSH b. POP c. BOTH A and B d. None of these

Description : Which is the basic stack operation: a. PUSH b. POP c. BOTH A and B d. None of these

Last Answer : c. BOTH A and B

Stack words on: a. LILO b. LIFO c. FIFO d. None of these

Description : Stack words on: a. LILO b. LIFO c. FIFO d. None of these

Last Answer : b. LIFO

Which point to the ___ of the stack: a. TOP b. START c. MID

Description : Which point to the ___ of the stack: a. TOP b. START c. MID

Last Answer : a. TOP

The processor uses the stack to keep track of where the items are stored on it this by using the: a. Stack pointer register b. Queue pointer register c. Both a & b d. None of these

Description : The processor uses the stack to keep track of where the items are stored on it this by using the: a. Stack pointer register b. Queue pointer register c. Both a & b d. None of these

Last Answer : a. Stack pointer register

The subprogram finish the return instruction recovers the return address from the: a. Queue b. Stack c. Program counter d. Pointer

Description : The subprogram finish the return instruction recovers the return address from the: a. Queue b. Stack c. Program counter d. Pointer

Last Answer : b. Stack

Which is used to store critical pieces of data during subroutines and interrupts: a. Stack b. Queue c. Accumulator d. Data register

Description : Which is used to store critical pieces of data during subroutines and interrupts: a. Stack b. Queue c. Accumulator d. Data register

Last Answer : a. Stack

SP stands for: a. Status pointer b. Stack pointer c. a and b d. None of these

Description : SP stands for: a. Status pointer b. Stack pointer c. a and b d. None of these

Last Answer : b. Stack pointer

In 8087, _______ many register stack are there? And of _____ registers. These registers are used as _________ stack. a) 7, 40 bit, FIFO. b) 8, 60 bit, LILO. c) 8, 80 bit, LIFO d) 7, 80 bit, FILO.

Description : In 8087, _______ many register stack are there? And of _____ registers. These registers are used as _________ stack. a) 7, 40 bit, FIFO. b) 8, 60 bit, LILO. c) 8, 80 bit, LIFO d) 7, 80 bit, FILO.

Last Answer : b) 8, 60 bit, LILO.

What is the output of the following code PUSH AL a) Decrement SP by 2 & push a word to stack b) Increment SP by 2 & push a word to stack c) Decrement SP by 2 & push a AL to stack d) Illegal

Description : What is the output of the following code PUSH AL a) Decrement SP by 2 & push a word to stack b) Increment SP by 2 & push a word to stack c) Decrement SP by 2 & push a AL to stack d) Illegal

Last Answer : b) Increment SP by 2 & push a word to stack

Can ROM be used as stack? a) Yes b) No c) sometimes yes, sometimes no

Description : Can ROM be used as stack? a) Yes b) No c) sometimes yes, sometimes no

Last Answer : b) No

Which stack is used in 8085? a) FIFO b) LIFO c) FILO

Description : Which stack is used in 8085? a) FIFO b) LIFO c) FILO

Last Answer : b) LIFO

In 8085 name the 16 bit registers? a) Stack pointer b) Program counter c) a & b

Description : In 8085 name the 16 bit registers? a) Stack pointer b) Program counter c) a & b

Last Answer : c) a & b

Describe the functions of stack pointer and program counter of 8085.

Description : Describe the functions of stack pointer and program counter of 8085. 

Last Answer : Stack pointer: 1. It is a 16 bit register which is used to store the address of topmost filled memory location of stack memory. 2. SP always points current top of stack. 3. If data is ... of memory and in 8085 the address of memory is 16 bit. Hence program counter is 16 bit register.

List the four instructions which control the interrupt structure of the 8085 microprocessor.

Description : List the four instructions which control the interrupt structure of the 8085 microprocessor.

Last Answer : • DI ( Disable Interrupts ) • EI ( Enable Interrupts ) • RIM ( Read Interrupt Masks ) • SIM ( Set Interrupt Masks )

What is the difference between the shift and rotate instructions?

Description : What is the difference between the shift and rotate instructions?

Last Answer : A rotate instruction is a closed loop instruction. That is, the data moved out at one end is put back in at the other end. The shift instruction loses the data that is moved out of the last bit locations.

List out the five categories of the 8085 instructions. Give examples of the instructions for each group.

Description : List out the five categories of the 8085 instructions. Give examples of the instructions for each group.

Last Answer : • Data transfer group – MOV, MVI, LXI. • Arithmetic group – ADD, SUB, INR. • Logical group –ANA, XRA, CMP. • Branch group – JMP, JNZ, CALL. • Stack I/O and Machine control group – PUSH, POP, IN, HLT.

Memory access in RISC architecture is limited to instructions a. CALL and RET b. PUSH and POP c. STA and LDA d. MOV and JMP

Description : Memory access in RISC architecture is limited to instructions a. CALL and RET b. PUSH and POP c. STA and LDA d. MOV and JMP

Last Answer : c. STA and LDA

In 8086 microprocessor one of the following instructions is executed before an arithmeticoperation a. AAM b) AAD c) DAS d) DAA

Description : In 8086 microprocessor one of the following instructions is executed before an arithmeticoperation a. AAM b) AAD c) DAS d) DAA

Last Answer : b) AAD

The status that cannot be operated by direct instructions isa) Cy b) Z c) P d) AC

Description : The status that cannot be operated by direct instructions isa) Cy b) Z c) P d) AC

Last Answer : d) AC

Computer instructions written with the use of English words instead of binary machine code is called a. Mnemonics b. Symbolic code c. Gray codes d. Opcode

Description : Computer instructions written with the use of English words instead of binary machine code is called a. Mnemonics b. Symbolic code c. Gray codes d. Opcode

Last Answer : b. Symbolic code

The instructions for starting the computer are house on a. Random access memory b. CD-Rom c. Read only memory chip

Description : The instructions for starting the computer are house on a. Random access memory b. CD-Rom c. Read only memory chip

Last Answer : c. Read only memory chip

Instructions and memory address are represented by a. Character code b. Binary codes c. Binary word d. Parity bit

Description : Instructions and memory address are represented by a. Character code b. Binary codes c. Binary word d. Parity bit

Last Answer : b. Binary codes

A computer program that translates one program instructions at a time into machine language is called a/an a. Interpreter b. CPU c. Compiler d. Simulator

Description : A computer program that translates one program instructions at a time into machine language is called a/an a. Interpreter b. CPU c. Compiler d. Simulator

Last Answer : a. Interpreter

In latest generation computers, the instructions are executed a. Parallel only b. Sequentially only c. Both sequentially and parallel d. All of above

Description : In latest generation computers, the instructions are executed a. Parallel only b. Sequentially only c. Both sequentially and parallel d. All of above

Last Answer : c. Both sequentially and parallel

The process of starting a or restarting a computer system by loading instructions from a secondary storage device into the computer memory is called a. Duping b. Booting c. Padding d. CPS

Description : The process of starting a or restarting a computer system by loading instructions from a secondary storage device into the computer memory is called a. Duping b. Booting c. Padding d. CPS

Last Answer : b. Booting

A microprocessor retries instructions from : a. Control memory b. Cache memory c. Main memory d. Virtual memory

Description : A microprocessor retries instructions from : a. Control memory b. Cache memory c. Main memory d. Virtual memory

Last Answer : c. Main memory

Which of the following instruction is of logical instructions? i) CPL A ii) JC rel iii) DA A iv) ANL A, Rn v) RR A vi) CPL bit a) i, v b) v, iii, I c) iv, ii d) v, iii, ii

Description : Which of the following instruction is of logical instructions? i) CPL A ii) JC rel iii) DA A iv) ANL A, Rn v) RR A vi) CPL bit a) i, v b) v, iii, I c) iv, ii d) v, iii, ii

Last Answer : c) iv, i

In 8087 coprocessor one of the following instructions is not valid a. FSIN b. FPTAN c. FIDIV d. FSQRT

Description : In 8087 coprocessor one of the following instructions is not valid a. FSIN b. FPTAN c. FIDIV d. FSQRT

Last Answer : a. FSIN

In 8086 microprocessor one of the following instructions is executed before an arithmetic operation a) AAM b) AAD c) DAS d) DAA

Description : In 8086 microprocessor one of the following instructions is executed before an arithmetic operation a) AAM b) AAD c) DAS d) DAA

Last Answer : b) AAD

IDIV and DIV instructions perform the same operations for? a) Unsigned number b) Signed number c) Signed number & Unsigned number d) none of above.

Description : IDIV and DIV instructions perform the same operations for? a) Unsigned number b) Signed number c) Signed number & Unsigned number d) none of above.

Last Answer : b) Signed number

The advantage of memory mapped I/O over I/O mapped I/O is, a) Faster b) Many instructions supporting memory mapped I/O c) Require a bigger address decoder d) All the above

Description : The advantage of memory mapped I/O over I/O mapped I/O is, a) Faster b) Many instructions supporting memory mapped I/O c) Require a bigger address decoder d) All the above

Last Answer : d) All the above

Which of the following instructions is not available in 8085 microprocessor?

Description : Which of the following instructions is not available in 8085 microprocessor? (A) LDA 3850 (B) XTHL (C) push PSW (D) LDAXH

Last Answer : Which of the following instructions is not available in 8085 microprocessor? (A) LDA 3850 (B) XTHL (C) push PSW (D) LDAXH

Which of the following terms is the most closely related to main memory? a. Non volatile b. Permanent c. Control unit d. Temporary

Description : Which of the following terms is the most closely related to main memory? a. Non volatile b. Permanent c. Control unit d. Temporary

Last Answer : d. Temporary

The register section is related to______ of the computer: a. Processing b. ALU c. Main memory d. None of these

Description : The register section is related to______ of the computer: a. Processing b. ALU c. Main memory d. None of these

Last Answer : c. Main memory

Define instruction cycle, machine cycle and T-state

Description : Define instruction cycle, machine cycle and T-state

Last Answer : Instruction cycle is defined, as the time required completing theexecution of an instruction. Machine cycle is defined as the time required completing one operation of accessing memory, I/O or ... request. Tcycle is defined as one subdivision of the operation performed in one clock period

Define memory segmentation. How memory segmentation is achieved in 8086? State advantages of memory segmentation.

Description : Define memory segmentation. How memory segmentation is achieved in 8086? State advantages of memory segmentation.

Last Answer : Memory Segmentation: The memory in an 8086 microprocessor is organized as a segmented memory. The physical memory is divided into 4 segments namely, - Data segment, Code Segment, Stack Segment and Extra ... 16 bit size. 6) Programs and data can be stored separately from each other in segmentation.

Define pipelining.

Description : Define pipelining.

Last Answer : Pipelining: Process of fetching the next instruction while the current instruction is executing is called pipelining which will reduce the execution time.

The Unix Kernel maintains two key data structures related to processes, the process table and the user structure. Which of following information is not the part of user structure? (A) File descriptor table (B) System call state (C) Scheduling parameters (D) Kernel stack

Description : The Unix Kernel maintains two key data structures related to processes, the process table and the user structure. Which of following information is not the part of user structure? (A) File descriptor table (B) System call state (C) Scheduling parameters (D) Kernel stack

Last Answer : (C) Scheduling parameters

Explain ALIGN & ASSUME

Description : Explain ALIGN & ASSUME

Last Answer : The ALIGN directive forces the assembler to align the nextsegment at an address divisible by specified divisor. The format is ALIGN number where number can be 2, 4, 8 or 16. Example ALIGN 8. The ASSUME ... the segment registers at execution time. Example ASSUME CS: code, DS: data, SS: stack

Explain the different instruction formats with examples

Description : Explain the different instruction formats with examples

Last Answer : The instruction set is grouped into the following formats • One byte instruction MOV C,A • Two byte instruction MVI A,39H • Three byte instruction JMP 2345H