MB89620 series
APPENDIX
275
APPENDIX
l
Index addressing
Indicated by “@IX+off” in the instruction list. Used to access the entire 64-Kbyte area. Index
addressing generates the address by adding the sign-extended contents of the first operand to
the index register (IX). Figure B.1d shows an example.
Figure B.1d Index Addressing
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Pointer addressing
Indicated by “@EP” in the instruction list. Used to access the entire 64-Kbyte area. Pointer
addressing uses the extra pointer (EP) as the address. Figure B.1e shows an example.
Figure B.1e Pointer Addressing
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General-purpose register addressing
Indicated by “Ri” in the instruction list. Used to access register banks in the general-purpose
register area. For general-purpose register addressing, the upper one byte of the address is
fixed at “01” and the lower one byte is generated from the register bank pointer (RP) and the
lower three bits of the operation code. The CPU accesses the resulting address. Figure B.1f
shows an example.
Figure B.1f General-Purpose Register Addressing
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Immediate addressing
Indicated by “#d8” in the instruction list. Used when immediate data is required. In immediate
addressing, the operand is used directly as immediate data. The operation code determines
whether the data is byte or word. Figure B.1g shows an example.
Figure B.1g Immediate Addressing
12
H
34
H
1234
H
MOVW
A,@IX+5 AH
A
27FF
H
2800
H
27A5
H
IX
+
12
H
34
H
1234
H
MOVW
A,@EP
A
27A5
H
27A6
H
27A5
H
EP
AB
H
AB
H
0156
H
MOV
A,R6
A
01010
B
RP
+
56
H
MOV
A,#56H
A
Содержание F2MC-8L MB89620 Series
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