Addressing; A.1 Addressing - Fujitsu 8FX Hardware Manual

MB95630H Series
A.1

Addressing

2
F MC-8FX has the following ten types of addressing:
• Direct addressing
• Extended addressing
• Bit direct addressing
• Index addressing
• Pointer addressing
• General-purpose register addressing
• Immediate addressing
• Vector addressing
• Relative addressing
• Inherent addressing
■ Explanation of Addressing
●
Direct addressing
This is used when accessing the direct area of "0x0000" to "0x047F" with addressing indicated
"dir" 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.
Figure A.1-1 shows an example.
●
Extended addressing
This is used when the area of the entire 64 Kbyte is accessed by addressing shown "ext" in the
instruction table. In this addressing, the first operand specifies one high rank byte of the address
and the second operand specifies one subordinate position byte of the address.
Figure A.1-2 shows an example.
MN702-00009-2v0-E
Figure A.1-1 Example of Direct Addressing
MOV 92H, A
DP 0b001
Figure A.1-2 Example of Extended Addressing
MOVW A, 1 2 3 4H
0x1234
0x1235
FUJITSU SEMICONDUCTOR LIMITED
APPENDIX A Instruction Overview
A
0x112 0x45
0x56
A 0x5678
0x78

A.1 Addressing

0x45
613