8088/8086 Instruction I

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REP String InstructionRepeat Prefix Instructions— The prefix instruction makes the microprocessor repeatedly execute the string instructionuntil CX decrements to 0 (During the execution, CX is decreased by one when the stringinstruction is executed one time).— For Example:MOV CX, 5REP MOVSBBy the above two instructions, the microprocessor will execute MOVSB 5 times.— Execution flow of REP MOVSB::While (CX!=0){CX = CX –1;MOVSB;}ORCheck_CX: If CX!=0 ThenCX = CX –1;MOVSB;goto Check_CX;end if8-12
REPZ String InstructionRepeat Prefix Instructions— Repeat the execution of the string instruction until CX=0 or zero flag is clear REPNZ String Instruction— Repeat the execution of the string instruction until CX=0 or zero flag is set REPE String Instruction— Repeat the execution of the string instruction until CX=0 or zero flag is clear REPNE String Instruction— Repeat the execution of the string instruction until CX=0 or zero flag is set8-13
Page 1 and 2: ECE 424 Design of Microprocessor-Ba
Page 3 and 4: Addressing ModesAddressing Modes Im
Page 5 and 6: Flags Commonly Tested During the Ex
Page 7 and 8: What is a Stack ?Instructions for S
Page 9 and 10: Data Transfer Instructions SAHF—
Page 11: String Instructions String is a col
Page 15 and 16: String Instructions MOVSB (MOVSW)
Page 17: String Instructions SCASB (SCASW)

8088/8086 Instruction I

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