Register Settings and Flag Effects Quiz

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What is the value of CL after the instruction INC CL is executed?

79h

How is the Sign Flag (SF) affected after the instruction INC CL is executed?

SF = 0

What is the value of the Carry Flag (CF) after the instruction INC CL is executed?

CF = 0

How is the Zero Flag (ZF) affected after the instruction INC CL is executed?

<p>ZF = 0</p> Signup and view all the answers

What are the flag settings after the AND BL, 0FH instruction?

<p>SF=0, ZF=0, PF=1, CF=0, OF=0</p> Signup and view all the answers

What does the Carry Flag (CF) indicate in the FLAGS register?

<p>Presence of carry out from the most significant bit on addition or borrow into the msb on subtraction</p> Signup and view all the answers

When is the Parity Flag (PF) set to 1 in the FLAGS register?

<p>The low byte of a result has an even number of one bits</p> Signup and view all the answers

What does the Auxiliary Carry Flag (AF) indicate in the FLAGS register?

<p>Presence of carry out from bit 3 on addition or borrow into bit 3 on subtraction</p> Signup and view all the answers

When is the Sign Flag (SF) set to 1 in the FLAGS register?

<p>The msb of a result is 1</p> Signup and view all the answers

What does the Overflow Flag (OF) indicate in the FLAGS register?

<p>Overflow has occurred in a signed operation</p> Signup and view all the answers

Study Notes

Flag Register and INC CL Instruction

  • After the instruction INC CL is executed, the value of CL is incremented by 1.
  • The Sign Flag (SF) is affected by the most significant bit of the result, being set to 1 if the result is negative and 0 if it's positive.
  • The Carry Flag (CF) is set to 1 if there is a carry from the most significant bit, otherwise, it's 0.
  • The Zero Flag (ZF) is set to 1 if the result is zero, and 0 if it's not.

Flag Settings after AND BL, 0FH

  • The flag settings after the AND BL, 0FH instruction depend on the result of the AND operation.

FLAGS Register

  • The Carry Flag (CF) indicates whether an operation has generated a carry from the most significant bit.
  • The Parity Flag (PF) is set to 1 if the result has even parity, and 0 if it has odd parity.
  • The Auxiliary Carry Flag (AF) indicates whether an operation has generated a carry from the lower nibble (bits 3-0) to the upper nibble (bits 7-4).
  • The Sign Flag (SF) is set to 1 if the result is negative, and 0 if it's positive.
  • The Overflow Flag (OF) indicates whether an operation has generated an overflow, which occurs when the result is greater than the maximum value that can be represented.

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