Operations:

Syntax:

Operation:

Operands:

Program Counter:

Opcode

Comment:

Stack:

RCALL k

PC = PC + k + 1

-2K <= k < 2K

PC = PC + k + 1

1101kkkkkkkkkkkk

Devices with 16-bit PC, 128 KB program memory maximum.

STACK = PC + 1

SP = SP - 2 (2 bytes, 16 bits)

RCALL k

PC = PC + k + 1

-2K <= k < 2K

PC = PC + k + 1

1101kkkkkkkkkkkk

Devices with 22-bit PC, 8 MB program memory maximum.

STACK = PC + 1

SP = SP - 3 (3 bytes, 22 bits)

Description

Relative call to an address within PC - 2K + 1 and PC + 2K (words). The return address (the instruction after the RCALL) is stored onto the Stack. See also CALL. For AVR microcontrollers with program memory not exceeding 4K words (8 KB), this instruction can address the entire memory from every address location. The Stack Pointer uses a post-decrement scheme during RCALL.

Status Register (SREG) and Boolean Formula

I

–

T

–

H

–

S

–

V

–

N

–

Z

–

C

–

Example: 

      rcall routine  ; Call subroutine
      ...
routine: 
      push  r14      ; Save r14 on the Stack
      ...
      pop   r14      ; Restore r14
      ret            ; Return from subroutine

Words

1 (2 bytes)

Table Cycles

Name

Cycles

9/16-bit PC

22-bit PC

AVRe

3(1)

4(1)

AVRxm

2(1)

3(1)

AVRxt

2

3

AVRrc

3

N/A

Note:

1.

Cycle times for data memory access assume internal RAM access and are not valid for accessing external RAM.