Operations:

Syntax:

Operation:

Operands:

Program Counter:

Opcode

Comment

Stack

BRVS k

If V == 1 then PC = PC + k + 1, else PC = PC + 1

-64 <= k <= +63

PC = PC + k + 1

PC = PC + 1, if the condition is false

111100kkkkkkk011

Description

Conditional relative branch. Tests the Overflow (V) flag and branches relatively to the PC if V is set. This instruction branches relatively to the PC in either direction (PC - 63 <= destination <= PC + 64). Parameter k is the offset from the PC and is represented in two's complement form. (Equivalent to instruction BRBS 3,k.)

Status Register (SREG) and Boolean Formula

I

–

T

–

H

–

S

–

V

–

N

–

Z

–

C

–

Example: 

        add   r3,r4   ; Add r4 to r3
        brvs  overfl  ; Branch if overflow
        ...
overfl: nop           ; Branch destination (do nothing)

Words

1 (2 bytes)

Table Cycles

Name

Cycles

i

ii

AVRxt

1

2

AVRrc

1

2

AVRe

1

2

AVRxm

1

2

i) If the condition is false.

ii) If the condition is true.