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Excerpts for 116B (224KB)
Excerpts for 116B (224KB)
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2.2.11 Program Counter Indirect with Displacement Mode<br />
Addressing Capabilities<br />
In this mode, the operand is in memory. The address of the operand is the sum of the<br />
address in the program counter (PC) and the sign-extended 16-bit displacement integer in<br />
the extension word. The value in the PC is the address of the extension word. This is a<br />
program reference allowed only <strong>for</strong> reads.<br />
.<br />
GENERATION:<br />
ASSEMBLER SYNTAX:<br />
EA MODE FIELD:<br />
EA REGISTER FIELD:<br />
NUMBER OF EXTENSION WORDS:<br />
EA = (PC) + d16<br />
(d 16,PC)<br />
111<br />
010<br />
1<br />
31<br />
0<br />
PROGRAM COUNTER<br />
CONTENTS<br />
DISPLACEMENT<br />
31 15<br />
0<br />
SIGN EXTENDED<br />
INTEGER<br />
+<br />
31<br />
0<br />
OPERAND POINTER<br />
CONTENTS<br />
POINTS TO<br />
MEMORY<br />
OPERAND<br />
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 2-13
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