Description:

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

Operation:

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

Syntax: Operands: Program Counter:

BRVS k -64 ≤ k ≤ +63 PC ← PC + k + 1

PC ← PC + 1, if condition is false

16-bit Opcode:

1111

00kk

kkkk

k011

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)

Cycles: 1 if condition is false

2 if condition is true