Motorola CPU32 Reference Manual page 92

ASL, ASR
Arithmetic Shift
ASL, ASR
Instruction Format (Memory Shifts):
15 14 13 12 11 10 9 8 7 6 5 4
3 2
o
EFFECTIVE ADDRESS
1 1 1 0 0 0 0
dr
1 1
MODE
I
REGISTER
Instruction Fields (Memory Shifts):
dr field - Specifies the direction of the shift:
o -
Shift right
1 - Shift left
Effective Address field - Specifies the operand to be shifted.
Only memory alterable addressing modes are allowed as shown:
Addressing Mode Mode Register Addressing Mode
On
- -
(xxx).w
An
- -
(xxx).L
(An) 010 Reg. number: An
#(data)
(An)
+
011 Reg. number: An
-(An) 100 Reg. number: An
(d16, An)
101
Reg. number: An (d16, PC)
(dS, An, Xn)
110 Reg. number: An
(dS, PC, Xn)
(bd, An, Xn)
110 Reg. number: An (bd, PC, Xn)
CPU32 REFERENCE MANUAL
INSTRUCTION SET
Mode
111
111
-
-
-
-
Register
000
001
-
-
-
-
MOTOROLA
4-39
III