Freescale Semiconductor, Inc.
JSR, JUMP TO SUBROUTINE
MAIN PROGRAM
PC
DIRECT
RTN
$9D = JSR
dd
NEXT MAIN INSTR.
MAIN PROGRAM
PC
INDEXED, X
RTN
$AD = JSR
ff
NEXT MAIN INSTR.
MAIN PROGRAM
PC
INDEXED, Y
RTN
$18 = PRE
$AD = JSR
ff
NEXT MAIN INSTR.
SP
SP+1
SP+2
SP+3
SP+4
SP+5
SP+6
SP+7
SP+8
³
SP+9
CCR
ACCB
ACCA
IX
H
IX
L
IY
H
IY
L
RTN
H
RTN
L
7
STACK
0
WAI, WAIT FOR INTERRUPT
INTERRUPT ROUTINE
PC
$3E = WAI
SP
SP+1
SP+2
SP+3
SP+4
SP+5
SP+6
SP+7
SP+8
³
SP+9
SWI, SOFTWARE INTERRUPT
MAIN PROGRAM
PC
$3F = SWI
³
SP–9
SP–8
SP–7
SP–6
SP–5
WAI, WAIT FOR INTERRUPT
MAIN PROGRAM
PC
$3E = WAI
SP–4
SP–3
SP–2
SP–1
CCR
ACCB
ACCA
IX
H
IX
L
IY
H
IY
L
RTN
H
RTN
L
7
STACK
0
CCR
ACCB
ACCA
IX
H
IX
L
IY
H
IY
L
RTN
H
RTN
L
7
STACK
0
Freescale Semiconductor, Inc...
MAIN PROGRAM
PC
INDEXED, Y
RTN
$BD = PRE
hh
ll
NEXT MAIN INSTR.
JMP, JUMP
MAIN PROGRAM
PC
INDEXED, X
X + ff
NEXT MAIN INSTR.
MAIN PROGRAM
PC
$18 = PRE
$6E = JMP
INDEXED, Y
ff
RTS, RETURN FROM
SUBROUTINE
MAIN PROGRAM
PC
X + ff
NEXT MAIN INSTR.
MAIN PROGRAM
PC
$7E = JMP
hh
EXTENDED
ll
$39 = RTS
PC
$6E = JMP
ff
BSR, BRANCH TO SUBROUTINE
MAIN PROGRAM
$8D = BSR
SP
7
³
SP–2
SP–1
SP
STACK
0
RTN
H
RTN
L
7
SP
SP+1
³
SP+2
STACK
0
RTN
H
RTN
L
LEGEND:
RTN = ADDRESS OF NEXT INSTRUCTION IN MAIN PROGRAM TO
BE EXECUTED UPON RETURN FROM SUBROUTINE
RTN
H
= MOST SIGNIFICANT BYTE OF RETURN ADDRESS
RTN
L
= LEAST SIGNIFICANT BYTE OF RETURN ADDRESS
³
= STACK POINTER POSITION AFTER OPERATION IS COMPLETE
dd = 8-BIT DIRECT ADDRESS ($0000–$00FF) (HIGH BYTE ASSUMED
TO BE $00)
ff = 8-BIT POSITIVE OFFSET $00 (0) TO $FF (256) IS ADDED TO INDEX
hh = HIGH-ORDER BYTE OF 16-BIT EXTENDED ADDRESS
ll = LOW-ORDER BYTE OF 16-BIT EXTENDED ADDRESS
rr= SIGNED RELATIVE OFFSET $80 (–128) TO $7F (+127) (OFFSET
RELATIVE TO THE ADDRESS FOLLOWING THE MACHINE CODE
OFFSET BYTE)
hh ll
NEXT MAIN INSTR.
HC11 STACK OPERATIONS
Figure 3-2 Stacking Operations
CENTRAL PROCESSING UNIT
TECHNICAL DATA
For More Information On This Product,
Go to: www.freescale.com
3-3
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
