Operations:

Syntax:

Operation:

Operands:

Program Counter:

Opcode

Comment

Stack

EOR Rd,Rr

Rd = Rd XOR Rr

0 <= d <= 31, 0 <= r <= 31

PC = PC + 1

001001rdddddrrrr

Description

Performs the logical EOR between the contents of register Rd and register Rr and places the result in the destination register Rd.

Status Register (SREG) and Boolean Formula

I

–

T

–

H

–

S

⇔

N XOR V, for signed tests.

V

0

0

Cleared.

N

⇔

R7

Set if MSB of the result is set; cleared otherwise.

Z

⇔

~R7 AND ~R6 AND ~R5 AND ~R4 AND ~R3 AND ~R2 AND ~R1 AND ~R0

Set if the result is 0x00; cleared otherwise.

C

–

R (Result)

R (Result) equals Rd after the operation.

Example: 

      eor   r4,r4    ; Clear r4
      eor   r0,r22   ; Bitwise exclusive or between r0 and r22

Words

1 (2 bytes)

Table Cycles

Name

Cycles

AVRe

1

AVRxm

1

AVRxt

1

AVRrc

1