Status Register (SREG) and Boolean Formula

H

Rd3 • K3 + K3 • R3 + R3 • Rd3

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

S

N ⊕ V, for signed tests.

V

Rd7 • K7 • R7 + Rd7 • K7 • 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 $00; cleared otherwise.

C

Rd7 • K7 + K7 • R7 + R7 • Rd7

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

R (Result) after the operation.

Example:

 cpi r19,3 ; Compare r19 with 3
 brne error ; Branch if r19<>3
 ...
error: nop ; Branch destination (do nothing)

Words

1 (2 bytes)

Cycles

1