Toggle bug with MEGA1280

There is a bug with toggle as shown in the following code. Amazingly, this occurs with a MEGA1280 but not with a MEGA128!

Code

program Bug;

Device = mega1280, VCC=5;

Import SysTick, LCDPort;

From System Import;

Define
  ProcClock      = 7372800;       {Hertz}
  SysTick        = 10;             {msec}
  StackSize      = 50, iData;
  FrameSize      = 50, iData;
  LCDtype = 44780; {66712}
  LCDport = PortA; {Port Address}
  LCDRows = 2; {2-lined display}
  LCDcolumns = 16; {16-character display}

uses
  ;

Implementation

{$IDATA}
const

type

{--------------------------------------------------------------}
{ Var Declarations }

var
  DebugLED [@PORTB, 2] : bit;

{--------------------------------------------------------------}
{ functions }
procedure ExecDebug;
begin
    Toggle( DebugLED );
end;

{ Main Program }
{$IDATA}

begin

  EnableInts;

  loop
    ExecDebug;

  endloop;
end Bug.

the assembler for ExecDebug is

Code

                        .FUNC     ExecDebug, 00027h, 00020h
Bug.ExecDebug:
                        .RETURNS   0
                        .BLOCK    40
                        .LINE     41
                        LDI      _ACCB, 004h
                        OUT       023h, _ACCB
                        .ENDBLOCK 42
Bug.ExecDebug_X:
                        .LINE     42
                        .BRANCH   19
                        RET
                        .ENDFUNC  42

As you can see the IN and EOR lines are missing. As I say, if I change the processor to a MEGA128 the lines are there!

Toggle bug with MEGA1280

Toggle bug with MEGA1280

Re: Toggle bug with MEGA1280

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