Status Register (SREG) and Boolean Formula

I	T	H	S	V	N	Z	C
–	–	–	⇔	⇔	⇔	⇔	⇔

S

N ⊕ V, for signed tests.

V

R15 • Rdh7

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

N

R15

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

Z

R15 • R14 • R13 • R12 • R11 • R10 • R9 • R8R7 • R6 • R5 • R4 • R3 • R2 • R1 • R0

Set if the result is $0000; cleared otherwise.

C

R15 • Rdh7

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

R (Result) equals Rdh:Rdl after the operation (Rdh7-Rdh0 = R15-R8, Rdl7-Rdl0=R7-R0).

Example:

 sbiw r25:r24,1 ; Subtract 1 from r25:r24
 sbiw YH:YL,63 ; Subtract 63 from the Y-pointer(r29:r28)