MC68030 Datasheet, PDF (58/602 Pages) Motorola, Inc – ENHANCED 32-BIT MICROPROCESSOR

Data Organization and Addressing Capabilities
2.4.16 Absolute Short Addressing Mode
In this addressing mode, the operand is in memory, and the address of the operand is in the
extension word. The 16-bit address is sign-extended to 32 bits before it is used.
GENERATION:
ASSEMBLER SYNTAX:
MODE:
REGISTER FIELD:
EXTENSION WORD:
EA GIVEN
(xxx).W
111
000
MEMORY ADDRESS:
NUMBER OF EXTENSION WORDS: 1
31
SIGN EXTENDED
15
0
MEMORY ADDRESS
31
0
OPERAND
2.4.17 Absolute Long Addressing Mode
In this mode, the operand is in memory, and the address of the operand occupies the two
extension words following the instruction word in memory. The first extension word contains
the high-order part of the address; the low-order part of the address is the second extension
word.
GENERATION:
ASSEMBLER SYNTAX:
MODE:
REGISTER FIELD:
FIRST EXTENSION WORD:
SECOND EXTENSION WORD:
EA GIVEN
(xxx).L
111
001
MEMORY ADDRESS:
NUMBER OF EXTENSION WORDS: 2
15
0
ADDRESS HIGH
15
0
ADDRESS LOW
31
0
CONCATENATION
31
0
OPERAND
2-20
MC68030 USER’S MANUAL
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