Table of Contents
Advertisement
APPENDIX
●
Program counter relative branch addressing (rel)
The address of the branch destination is a value determined by adding an 8-bit offset to the program counter
(PC) value. If the result of addition exceeds 16 bits, bank register incrementing or decrementing is not
performed and the excess part is ignored, and therefore the address is contained within a 64-kilobyte bank.
This addressing is used for both conditional and unconditional branch instructions. Address bits 16 to 23 are
indicated by the program bank register (PCB).
Figure B.4-7 Example of program counter relative branch addressing (rel)
BRA 3B20H
●
Register list (rlst)
Specify a register to be pushed onto or popped from a stack.
A register is selected when the corresponding bit is 1 and deselected when the bit is 0.
974
(This instruction causes an unconditional relative branch.)
Before execution
PC
3 C 2 0
After execution
PC
3 B 2 0
Figure B.4-8 Configuration of the register list
MSB
RW7 RW6 RW5 RW4 RW3 RW2 RW1 RW0
MB96300 Super Series Hardware Manual
PCB
4 F
Memory space
4F3C22H
F F
4F3C21H
F E
4F3C20H
6 0
PCB
4 F
4F3B20H
Next instruction
LSB
BRA 3B20H
Advertisement
Table of Contents
