Lds/les instruction execution-microprocessor, Assembly Language

Assignment Help:

LDS/LES Instruction execution :

 LAHF: Load AH from Lower Byte of Flag: - This instruction loads the AH register with the lower byte of the flag register. This instruction can be utilized to observe the status of all the condition code flags (except over flow) at a time.

SAHF: Store AH to Lower Byte of Flag Register. This instruction resets or sets the condition code flags (except overflow) in the lower byte of the flag register depending on the equivalent bit positions in AH. If a bit in AH is value1, the flag equivalent to the bit position is set, else it is reset.

PUSHF: Push Flags to Stack: - The push flag instruction pushes the flag register on the stack; first the upper byte and then the lower byte will be pushed on the stack. The SP is decremented by value 2, for each push operation. The basic operation of this instruction is same to the PUSH operation.

POPF: Pop Flags from Stack:-The pop flags instruction loads the flag register totally (both bytes) from the word contents of the memory location currently addressed by SS and SP. The SP is incremented by the value 2 for each pop operation.


Related Discussions:- Lds/les instruction execution-microprocessor

Mmm development board, Write an account of your findings and produce a repo...

Write an account of your findings and produce a report containing all aspects of the above. Include a step-by-step 'simple User Guide' so that your program can be operated as inten

Procedures, How to define procedures?

How to define procedures?

Program which allows the user to select from menu, Write a 32-bit program w...

Write a 32-bit program which when run, allows the user to select from a menu: (1)    Enter a Binary Number (2)    Enter a Decimal Number (3)    Enter a Hexadecimal Number

Lab Assignment, 1) Write an 80x86 assembly language program in EXE file for...

1) Write an 80x86 assembly language program in EXE file format to do the following tasks: a) Open and read the contents of a file into memory (use at least 1 kB). b) Sort the li

Solotuon, using 8086 assembly language that interchange upper four bits to ...

using 8086 assembly language that interchange upper four bits to lower four bits. assume that data store in byte memory and it written back to same location. and assume the data as

Digital and embedded software, hi!im looking for someone who expert in an a...

hi!im looking for someone who expert in an assembly language and help me write the programmed!Thank you

Program to add contents in memory-machine level programs, Example : Add th...

Example : Add the contents of the 2000H: 0500H memory location to contents of 3000H: 0600H and store the result in 5000H: 0700H. Solution : Unlike the past example progra

Microcontroller, bello need help with a final project , I have to do a pres...

bello need help with a final project , I have to do a presentation on a digital stop watch , but I have to use edsim51 to make it wondering if you guys can help me

Ddition, Write a program that performs the addition, subtraction, multiplic...

Write a program that performs the addition, subtraction, multiplications, division of the given operands. Perform BCD operation for addition and subtraction.

Write a program, write a program that calculates the fibonacci series: exce...

write a program that calculates the fibonacci series: except for the first two numbers in the sequence

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd