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Physical direct branch addressing (addr24)
Specify an offset explicitly for the branch destination address. The size of the offset is 24 bits. Physical
direct branch addressing is used for unconditional branch, subroutine call, or software interrupt instruction.
Figure B.3-4 Example of Direct Branch Addressing (addr24)
JMPP 333B20H (This instruction causes an unconditional branch by direct branch 24-bit
addressing.)
Before execution
After execution
●
I/O direct addressing (io)
Specify an 8-bit offset explicitly for the memory address in an operand. The I/O address space in the
physical address space from 000000
and direct page register (DPR). A bank select prefix for bank addressing is invalid if specified before an
instruction using I/O direct addressing.
Figure B.3-5 Example of I/O Direct Addressing (io)
MOVW A, i : 0C0H (This instruction reads data by I/O direct addressing and stores it
in A.)
Before execution
After execution
PC 3 C 2 0
PCB 4 F
PC 3 B 2 0
PCB 3 3
to 0000FF
H
A 0 7 1 6
2 5 3 4
A 2 5 3 4 F F E E
Memory space
333B20
Next instruction
H
4F3C20
6 3
H
4F3C21
2 0
H
4F3C22
3 B
H
4F3C23
3 3
H
is accessed regardless of the data bank register (DTB)
H
Memory space
0000C0
E E
H
0000C1
F F
H
APPENDIX B Instructions
H
JMPP 333B20
627
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