Motorola CPU32 Manuale Utente Pagina 111

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Integer Instructions
MOTOROLA
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
4-7
ADDA
Add Address
ADDA
(M68000 Family)
Operation:
Source + Destination
Destination
Assembler
Syntax:
ADDA < ea > , An
Attributes:
Size = (Word, Long)
Description:
Adds the source operand to the destination address register and stores the
result in the address register. The size of the operation may be specified as word or
long. The entire destination address register is used regardless of the operation size.
Condition Codes:
Not affected.
Instruction Format:
Instruction Fields:
Register field—Specifies any of the eight address registers. This is always the
destination.
Opmode field—Specifies the size of the operation.
011—Word operation; the source operand is sign-extended to a long operand and
the operation is performed on the address register using all 32 bits.
111— Long operation.
1514131211109876543210
1101 REGISTER OPMODE
EFFECTIVE ADDRESS
MODE REGISTER
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