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APPENDIX
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Accumulator indirect branch addressing (@A)
The address of the branch destination is the content (16 bits) of the low-order bytes (AL) of the accumulator.
It indicates the branch destination in the bank address space. Address bits 16 to 23 are specified by the
program bank register (PCB). For the Jump Context (JCTX) instruction, however, address bits 16 to 23 are
specified by the data bank register (DTB). This addressing is used for unconditional branch instructions.
Figure B.4-11 Example of accumulator indirect branch addressing (@A)
JMP @A
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Indirect specification branch addressing (@ear)
The address of the branch destination is the word data at the address indicated by ear.
Figure B.4-12 Example of indirect specification branch addressing (@ear)
JMP @@RW0
976
(This instruction causes an unconditional branch by accumulator indirect branch
addressing.)
Before execution
PC
3 C 2 0
A
6 6 7 7
After execution
PC
3 B 2 0
A
6 6 7 7
(This instruction causes an unconditional branch by register indirect addressing.)
Before execution
PC
3 C 2 0
PW0
7 F 4 8
After execution
PC
3 B 2 0
PW0
7 F 4 8
MB96300 Super Series Hardware Manual
PCB
4 F
Memory space
3 B 2 0
4F3C20H
6 1
4F3B20H
Next instruction
PCB
4 F
3 B 2 0
PCB
4 F
Memory space
DTB
2 1
4F3C21H
0 8
4F3C20H
7 3
4F3B20H
Next instruction
PCB
4 F
217F49H
3 B
217F48H
2 0
DTB
2 1
JMP @A
JMP @@RW0
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