Scas-string manipulation instruction-microprocessor, Assembly Language

Assignment Help:

SCAS : Scan String Byte or String Word:-

This instruction scans a string of words or byte for an operand word or byte specified in the register AL or  register AX. The string is pointed to by ES: DI register pair. The length of the string is stored in register CX. The DF controls the mode for scanning of the string as stated in the case of MOVSB instruction. Whenever a match to the mention operand is found in string, execution stops and the zero flag is goes set. If no match is found, the zero flag is reset. The REPNE prefix is utilized with the SCAS instruction. The counters and pointers are updated automatically, until a match is found. Following string of instructions elaborates the use of SCAS instruction.

Example :

1987_SCAS.jpg

This string of instructions finds out, if contains WORD. If the WORD is found in the word string, before register CX becomes zero, the ZF is set, or else the ZF is reset. The scanning will continue until a match is found. Once a match is establish, the execution of the programme furtherproceeds.


Related Discussions:- Scas-string manipulation instruction-microprocessor

8088 associated with 8259 a-microprocessor, For an 8088 the 2 addresses lin...

For an 8088 the 2 addresses linked with an 8259A are normally consecutive, and the AO line is associated to the AO pin, but because there are just 8 data pins on the 8259A and the

Risc characteristics-microprocessor, RISC Characteristics : The  concep...

RISC Characteristics : The  concept  of  RISC  architecture  include  an  attempt  to  reduce  execution  time  by make  simple  the instruction set of the computer. The main c

FIRE ALARM PROGRAMMING, PLEASE MAY YOU ASSIST ME WITH SAMPLE CODES FOR PROG...

PLEASE MAY YOU ASSIST ME WITH SAMPLE CODES FOR PROGRAMING A FIRE ALARM MINI PROJECT

Pointer and index registers-microprocessor, Pointer and Index Registers ...

Pointer and Index Registers The pointers contain offset within the specific segments. The pointers BP, IP and SP generally containoffsets within thedata, code and stack segment

Instruction set of 8086-microprocessor, Instruction set of 8086 : The 8...

Instruction set of 8086 : The 8086/8088 instructions are categorized into the following major types. This section describes the function of each of the instructions with approp

Program, write a program assembly language for adding two 3*3 matrix

write a program assembly language for adding two 3*3 matrix

I want to make a calculator, 64-bit integer calculator, which processes usi...

64-bit integer calculator, which processes using 16-bits at a time (reg/mem16 operands)

Hi, i have a question.

i have a question.

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