Status Register (SREG) and Boolean Formula

I T H S V N Z C
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 • Rr7R7 + 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

R7R6R5R4R3R2R1R0

Set if the result is $00; 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)
Words
1 (2 bytes)
Cycles
1