subject:microprocessor&assembly language
Homework Answers
What will be the content of the AX register and carry flag after the execution of following instruction:
SAR AX, CL
CL = 0216 and AX = 091A16.
Answer: AX = 024616 and carry flag CF = 1
Description:
• Instruction: SAR - Shift Arithmetic Right
• Instruction format: SAR Operand1, Operand2
• The above instruction shifts the all the bits of Operand1 to the right side by the amount specified in Operand2. The most significant bit or sign bit will remain same as before shift and the least significant bit goes to the carry flag.
• Instruction SAR AX, CL will perform AX = AX >> CL.
• Provided AX = 0x091A will be shifted right side 2 times.
• So, the register AX = 0x0246 and CF = 1.
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subject:microprocessor&assembly language
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