6.61.2 Status Register and Boolean Formula
I | T | H | S | V | N | Z | C |
– | – | – | ⇔ | ⇔ | ⇔ | ⇔ | – |
- S
- N ⊕ V, for signed tests.
- V
-
R7 ∧ R6 ∧ R5 ∧ R4 ∧ R3 ∧ R2 ∧ R1 ∧ R0
Set if two’s complement overflow resulted from the operation; cleared otherwise. Two’s complement overflow occurs only if Rd was
0x7F
before the operation. - 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.
R (Result) equals Rd after the operation.
Example:
clr r22 ; clear r22 loop: inc r22 ; increment r22 ... cpi r22,0x4F ; Compare r22 to 0x4f brne loop ; Branch if not equal nop ; Continue (do nothing)
- Words
- 1 (2 bytes)
Name | Cycles |
---|---|
AVRe | 1 |
AVRxm | 1 |
AVRxt | 1 |
AVRrc | 1 |