Status register

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Status register

  1. 1. Status register and Shift register Design<br />
  2. 2. Status register<br />Relative magnitude of two numbers may be determined by subtracting one from the other.<br />Also called as flag bits or condition code bits<br />Status Bits<br />C – Carry<br />S – Sign bit<br />Z – zero bit<br />V – Overflow bit<br />
  3. 3. Status register<br />
  4. 4. Status register<br />C – Carry bit<br />Set if the output carry of ALU is 1<br />S – Sign bit<br />Set if the highest order bit is 1<br />Z – Zero bit<br />Set if the ALU’s output contains all zeros<br />V - Overflow bit<br />Set if there is any overflow. For a 8bit ALU, V is set if the result is greater than 127 and less than -128<br />
  5. 5. (A-B) of unsigned numbers <br />A and B are unsigned numbers<br />
  6. 6. SHIFTER<br />
  7. 7. Shifter <br />

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