MB95630H Series
614 FUJITSU SEMICONDUCTOR LIMITED MN702-00009-2v0-E
APPENDIX A Instruction Overview
A.1 Addressing
● Bit direct addressing
This is used when accessing the direct area of "0x0000" to "0x047F" in bit unit with addressing
indicated "dir:b" in instruction table. In this addressing, when the operand address is "0x00" to
"0x7F", it is accessed into "0x0000" to "0x007F". Moreover, when the operand address is
"0x80" to "0xFF", the access can be mapped in "0x0080" to "0x047F" by setting of direct bank
pointer DP. The position of the bit in the specified address is specified by the values of the
instruction code of three subordinate position bits.
Figure A.1-3 shows an example.
Figure A.1-3 Example of Bit Direct Addressing
● Index addressing
This is used when the area of the entire 64 Kbyte is accessed by addressing shown "@IX+off"
in the instruction table. In this addressing, the content of the first operand is sign extended and
added to IX (index register) to the resulting address. Figure A.1-4 shows an example.
Figure A.1-4 Example of Index Addressing
● Pointer addressing
This is used when the area of the entire 64 Kbyte is accessed by addressing shown "@EP" in
the instruction table. In this addressing, the content of EP (extra pointer) is assumed to be an
address. Figure A.1-5 shows an example.
Figure A.1-5 Example of Pointer Addressing
● General-purpose register addressing
This is used when accessing the register bank in general-purpose register area with the
addressing shown "Ri" in instruction table. In this addressing, fix one high rank byte of the
address to "01" and create one subordinate position byte from the contents of RP (register bank
pointer) and three subordinate bits of the operation code to access to this address. Figure A.1-6
shows an example.
SETB 34H : 2
0bXXXXX1XX0x0034
7 6 5 4 3 2 1 0
0bXXXDP
0x27FF
MOVW A, @IX+ 5AH
0x1234A
0x12
0x340x2800
0x27A5
IX
0x27A5
MOVW A, @EP
0x1234
A
0x12
0x340x27A6
0x27A5
EP
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