Motorola 68000 User Manual

3
The 68000's Instruction Set
ADD Add binary
Operation: [destination] ← [source] + [destination]
Syntax: ADD <ea>,Dn
ADD Dn,<ea>
Attributes: Size = byte, word, longword
Description: Add the source operand to the destination operand and store the
result in the destination location.
Condition codes: X N Z V C
* * * * *
Source operand addressing modes
Destination operand addressing modes
ADDA Add address
Operation: [destination] ← [source] + [destination]
Syntax: ADDA <ea>,An
Attributes: Size = word, longword
Description: Add the source operand to the destination address register and
store the result in the destination address register. The source is
sign-extended before it is added to the destination. For example,
if we execute ADDA.W D3,A4 where A4 = 00000100
16
and D3.W =
8002
16
, the contents of D3 are sign-extended to FFFF8002
16
and
added to 00000100
16
to give FFFF8102
16
, which is stored in A4.

Motorola 68000 Specifications

General

Architecture	CISC
Data Width	16-bit
Address Width	24-bit
Transistor Count	68, 000
Instruction Set	Motorola 68000
Maximum Addressable Memory	16 MB
Manufacturer	Motorola
Model	68000
Type	Microprocessor
Voltage	5 V
Process Technology	3.5 μm
Package	64-pin DIP, 68-pin PGA, 68-pin PLCC