Lods-stos-string manipulating instruction-microprocessor, Assembly Language

Assignment Help:

LODS : Load String Byte or String Word:-

The LODS instruction loads AL/AX register by the content of a string pointed to by DS:SI register pair. The SI is automatically modified depending on the DF. If it is a byte transfer (LODSB), SI is modified by one and if it is a word transfer (LODSW), the SI is modified by two. No other flags are changed by this instruction.

STOS : Store String Byte or String Word:-

The STOS instruction stores the AL/AX register contents to a location in the string pointed by theES: Dl register pair. Accordingly the Dl is modified. No flags are changed by this instruction. The direction flag controls the string instruction execution. The source index (SI) and destination index (D1) are automatically modified after each iteration. If the DF = 1, then the execution follows auto decrement mode. In this mode, DI and Sl are decremented automatically after each iteration (by 1 or 2 depending on the word or byte operations). Hence, in auto decrementing mode, the strings are mention to by their ending addresses. If the DF = 0, then the execution follows autoincrement mode. In this mode, D1 and S1 are incremented automatically (by 1 or 2 depending on word or byte operation) after each iteration, so in this case, the strings are mention to by their starting addresses.


Related Discussions:- Lods-stos-string manipulating instruction-microprocessor

Write an assembly language program, Your assignment for this project is to ...

Your assignment for this project is to write an assembly language program that checks if the user's input is a valid ISBN number. A sample run of your program might look like:

Login system, a pseudo-code to add username and password combination up to ...

a pseudo-code to add username and password combination up to a limit of 10

Average of odd numbers, write an assembly language program to find average ...

write an assembly language program to find average of odd numbers from an array of 8 bit numbers

Segment registers-microprocessor, Segment Registers The 8086 addresses ...

Segment Registers The 8086 addresses a segmented memory unlike 8085. The complete 1 megabyte memory, which 8086 is capable to address is divided into 16 logical segments.Thusea

Write an assembly program to simulate a microwave, 1. The microwave has a c...

1. The microwave has a clock (hh:mm:ss am/pm) and the user should be able to change the clock at any time. 2. For cooking the user should first enter the time. The user can ente

Shl, Assume that the registers are initialized to EAX=12345h,EBX =9528h EC...

Assume that the registers are initialized to EAX=12345h,EBX =9528h ECX=1275h,EDX=3001h sub AH,AH sub DH,DH mov DL,AL mov CL,3 shl DX,CL shl AX,1 add DX,AX

Assignment, You have to write a subroutine (assembly language code using NA...

You have to write a subroutine (assembly language code using NASM) for the following equation.

Short-type-global-assemblers operator-microprocessor, SHORT  : The  SHO...

SHORT  : The  SHORT operator denoted to the assembler that only one byte is needed to code the displacement for a jump (for example displacement is within -128 to +127 bytes fr

Nible, calculate the number of one bits in bx and complement an equal numbe...

calculate the number of one bits in bx and complement an equal number of least significant bits in ax hint use the xor instruction

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