Operations:

Syntax:

Operation:

Operands:

Program Counter:

Opcode

Comment

Stack

BRLO k

If Rd < Rr (C == 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

111100kkkkkkk000

Description

Conditional relative branch. Tests the Carry (C) flag and branches relatively to the PC if C is set. If the instruction is executed immediately after any of the instructions CP, CPI, SUB, or SUBI, the branch will occur only if the unsigned binary number represented in Rd was smaller than the unsigned binary number represented in Rr. 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 0,k.)

Status Register (SREG) and Boolean Formula

I

–

T

–

H

–

S

–

V

–

N

–

Z

–

C

–

Example: 

      eor   r19,r19   ; Clear r19
loop: inc   r19       ; Increase r19
      ...
      cpi   r19,0x10  ; Compare r19 with 0x10
      brlo  loop      ; Branch if r19 < 0x10 (unsigned)
      nop             ; Exit from loop (do nothing)

Words

1 (2 bytes)

Table Cycles

Name

Cycles

i

ii

AVRe

1

2

AVRxm

1

2

AVRxt

1

2

AVRrc

1

2

i) If the condition is false.

ii) If the condition is true.