FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 285)

271
APPENDIX B Overview of Instructions
●
General-purpose register addressing
General-purpose register addressing is indicated by Ri in the instruction list. This addressing is used to
access a register bank in the general-purpose register area. In this addressing mode, the higher byte of the
address is always 01 and the lower byte is specified based on the contents of RP (register bank pointer) and
the lower three bits of the operation code. Figure B.2-6 "Example of general-purpose register addressing"
shows an example.
Figure B.2-6 Example of general-purpose register addressing
●
Immediate addressing
Immediate addressing is indicated by #d8 in the instruction list. This addressing is used when immediate
data is required. In this addressing mode, the operand is used as immediate data. Whether the data is
specified in bytes or words is determined by the operation code. Figure B.2-7 "Example of immediate
addressing" shows an example.
Figure B.2-7 Example of immediate addressing
0 1 5 6 H
MOV A, R 6
AB H A A B H 0 1 0 1 0 B RP
MOV A, #56
H
5 6 H A