Motorola CPU32 Reference Manual page 203

SUB Subtract
SUB
Effective Address field - Determines the addressing mode. If the location specified is a source
operand, all addressing modes are allowed as shown:
Addressing Mode
Mode
Register Addressing Mode Mode Register
On 000
Reg. number: On (xxx).W 111 000
An*
001 Reg. number: An (xxx).L 111 001
(An) 010 Reg. number: An
#(data)
111
100
(An)
+
011 Reg. number: An
-(An) 100 Reg. number: An
(d16, An)
101 Reg. number: An
(d16, PC)
111 010
(ds, An, Xn)
110 Reg. number: An
(ds, PC, Xn)
111 011
(bd, An, Xn) 110 Reg. number: An (bd, PC, Xn) 111 011
*For byte size operation, address register direct is not allowed.
If the location specified is a destination operand, only memory alterable addressing modes are
allowed as shown:
Addressing Mode
Mode Register Addressing Mode Mode Register
On
-
-
(xxx).W 111 000
An
-
-
(xxx).L 111 001
(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
(dB, PC, Xn) -
-
(bd, An, Xn) 110 Reg. number: An (bd, PC, Xn)
-
-
NOTES:
1. If the destination is a data register, it must be specified as a destination On address, not as a
destination (ea) address.
2. Most assemblers use SUBA when the destination is an address register, and SUB I or SUBQ when
the source is immediate data.
MOTOROLA
4-150
INSTRUCTION SET CPU32 REFERENCE MANUAL