6.45.2 Status Register (SREG) and Boolean Formula

H

Rd3 ∧ Rr3 ∨ Rr3 ∧ R3 ∨ R3 ∧ Rd3

Set if there was a borrow from bit 3; cleared otherwise.

S

N ⊕ V, for signed tests.

V

Rd7 ∧ Rr7 ∧ R7 ∨ Rd7 ∧ Rr7 ∧ R7

Set if two’s complement overflow resulted from the operation; cleared otherwise.

N

R7

Set if MSB of the result is set; cleared otherwise.

Z

R7 ∧ R6 ∧ R5 ∧ R4 ∧ R3 ∧ R2 ∧ R1 ∧ R0

Set if the result is 0x00; cleared otherwise.

C

Rd7 ∧ Rr7 ∨ Rr7 ∧ R7 ∨ R7 ∧ Rd7

Set if the absolute value of the contents of Rr is larger than the absolute value of Rd; cleared otherwise.

R (Result) after the operation.

Example:

      cp    r4,r19  ; Compare r4 with r19
      brne  noteq   ; Branch if r4 <> r19
      ...
noteq: 
      nop           ; Branch destination (do nothing)