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APPENDIX
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Program counter indirect addressing with offset (@PC + disp16)
Memory is accessed using the address indicated by (instruction address + 4 + disp16). The offset is one
word long. Address bits 16 to 23 are specified by the program bank register (PCB). Note that the operand
address of each of the following instructions is not deemed to be (next instruction address + disp16):
• DBNZ eam, rel
• DWBNZ eam, rel
• CBNE eam, #imm8, rel
• CWBNE eam, #imm16, rel
• MOV eam, #imm8
• MOVW eam, #imm16
Figure B.4-5 Example of Program Counter Indirect Addressing with Offset (@PC + disp16)
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Register indirect addressing with base index (@RW0 + RW7, @RW1 + RW7)
Memory is accessed using the address determined by adding RW0 or RW1 to the contents of general-
purpose register RW7. Address bits 16 to 23 are indicated by the data bank register (DTB).
Figure B.4-6 Example of Register Indirect Addressing with Base Index (@RW0 + RW7, @RW1 + RW7)
MOVW
A, @PC+20H
0 7 1 6A
2 5 3 4
C 5PCB
C 5
F F
E E
0 0
2 0
MOVW
A, @PC+20H
2 5 3 4A
F F E E
PCB
C5457BH
C5457AH
C54559H
C54558H
9 E
7 3
C54557H
C54556H
C5455AH
+20H
+4
4 5 5 6
PC
4 5 5 A
PC
Before execution
After execution
Memory space
(This instruction reads data by program counter indirect addressing with a
offset and stores it in A.)
MOVW A, @RW1+RW7
0 7 1 6A
D 3 0 F
2 5 3 4
RW1 F F
E E
2 5 3 4A
D 3 0 F
F F E E
RW1
0 1 0 1
RW7
7 8DTB
0 1 0 1
RW7
7 8
DTB
78D411H
78D410H
+
Before execution
After execution
Memory space
(This instruction reads data by register indirect addressing with a
base index and stores it in A.)