Topic       : MC56001 Documentation
Author      : JAY Software
Version     : 1.0 (19/11/1997)
Subject     : Programming/Assembler
Nodes       : 152
Index Size  : 4106
HCP-Version : 4
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : 
@help       : 
@options    : -i +y +z -t4
@width      : 100
View Ref-FileRTI                     Return from Interrupt

Operation:
    SSH -> PC
    SSL -> SR
    SP - 1 -> SP

Assembler Syntax:
    RTI

Description:
    Pull the program counter (PC) and the status register (SR)
from the stack. The previous program counter and status register are lost.

Restrictions:
    Due to pipelining in the program controller and the fact
that the RTI instruction accesses certain controller registers, the RTI
instruction must be immediately preceded by any of the following
instructions:

Immediately before RTI:
    MOVEC to LA, LC, SSH, SSL, or SP
    MOVEM to LA, LC, SSH, SSL, or SP
    MOVEP to LA, LC, SSH, SSL, or SP
    MOVEC from SSH
    MOVEM from SSH
    MOVEP from SSH
    ANDI MR or ANDI CCR
    ORI MR or ORI CCR


An RTI instruction cannot be the LAST instruction in a DO loop (at LA).
An RTI instruction cannot be repeated using the REP instruction.

Condition Codes:

    L- Set according to the value pulled from the stack
    E- Set according to the value pulled from the stack
    U- Set according to the value pulled from the stack
    N- Set according to the value pulled from the stack
    Z- Set according to the value pulled from the stack
    V- Set according to the value pulled from the stack
    C- Set according to the value pulled from the stack


Instruction Format:
    RTI

Timing:     4+rx oscillator clock cycles

Memory:     1 program word