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II
LEA
Operation:
Assembler
Syntax:
Attributes:
Load Effective Address
LEA
(ea)
=> An
LEA (ea), An
Size
=
(Long)
Description:
Loads the effective address into the specified address register. All 32 bits of the
address register are affected by this instruction.
Condition Codes:
Not affected.
Instruction Format:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
o
EFFECTIVE ADDRESS
0
1
0
0
REGISTER
1
1
1
I
MODE
REGISTER
Instruction Fields:
Register field - Specifies the address register to be updated with the effective address.
Effective Address field -
Specifies the address to be loaded into the address register. Only
control addressing modes are allowed as shown:
Addressing Mode
MOTOROLA
4-88
Dn
An
(An)
(An)
+
- (An)
(d16, An)
(d8' An, Xn)
(bd, An, Xn)
Mode
-
-
010
-
-
101
110
110
Register
Addressing Mode Mode
Register
-
(xxx).w
111
000
-
(xxx).L
111
001
Reg. number: An
#(data)
-
-
-
-
Reg. number: An
(d16, PC)
111
010
Reg. number: An
(d8, PC, Xn)
111
011
Reg. number: An
(bd, PC, Xn)
111
011
INSTRUCTION SET
CPU32 REFERENCE MANUAL
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