Excerpts for 116B (224KB)
Excerpts for 116B (224KB)
Excerpts for 116B (224KB)
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Addressing Capabilities<br />
2.2.1 Data Register Direct Mode<br />
In the data register direct mode, the effective address field specifies the data register<br />
containing the operand.<br />
.<br />
GENERATION:<br />
ASSEMBLER SYNTAX:<br />
EA MODE FIELD:<br />
EA REGISTER FIELD:<br />
NUMBER OF EXTENSION WORDS:<br />
EA = Dn<br />
Dn<br />
000<br />
REG. NO.<br />
0<br />
DATA REGISTER<br />
OPERAND<br />
2.2.2 Address Register Direct Mode<br />
In the address register direct mode, the effective address field specifies the address register<br />
containing the operand.<br />
.<br />
GENERATION:<br />
ASSEMBLER SYNTAX:<br />
EA MODE FIELD:<br />
EA REGISTER FIELD:<br />
NUMBER OF EXTENSION WORDS:<br />
EA = An<br />
An<br />
001<br />
REG. NO.<br />
0<br />
ADDRESS REGISTER<br />
OPERAND<br />
2.2.3 Address Register Indirect Mode<br />
In the address register indirect mode, the operand is in memory. The effective address field<br />
specifies the address register containing the address of the operand in memory.<br />
.<br />
GENERATION:<br />
ASSEMBLER SYNTAX:<br />
EA MODE FIELD:<br />
EA REGISTER FIELD:<br />
NUMBER OF EXTENSION WORDS:<br />
EA = (An)<br />
(An)<br />
010<br />
REG. NO.<br />
0<br />
31<br />
0<br />
ADDRESS REGISTER<br />
OPERAND POINTER<br />
POINTS TO<br />
MEMORY<br />
OPERAND<br />
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 2-5
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