6.92.2 Status Register (SREG) and Boolean Formula

S

N ⊕ V, for signed tests.

V

N ⊕ C, for N and C after the shift.

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

Rd0

Set if, before the shift, the LSB of Rd was set; cleared otherwise.

R (Result) equals Rd after the operation.

Example:

      lsr   r19       ; Divide r19:r18 by two
      ror   r18       ; r19:r18 is an unsigned two-byte integer
      brcc  zeroenc1  ; Branch if carry cleared
      asr   r17       ; Divide r17:r16 by two
      ror   r16       ; r17:r16 is a signed two-byte integer
      brcc  zeroenc2  ; Branch if carry cleared
      ...
zeroenc1: 
      nop             ; Branch destination (do nothing)
      ...
zeroenc1: 
      nop             ; Branch destination (do nothing)

Words

1 (2 bytes)