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APPENDIX B Instructions
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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-Kbyte
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)
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Register list (rlst)
Specify a register to be pushed onto or popped from a stack.
Figure B.4-8 Configuration of the Register List
BRA 3B20
H
3 C 2 0
PC
4 FPCB
3 B 2 0
PC
4 FPCB
Before execution
After execution
Memory space
(This instruction causes an unconditional relative branch.)
Next instruction
4F3B20
H
4F3C20
H
6 0
F E
4F3C21
H
BRA 3B20
H
F F4F3C22
H
RW7 RW6 RW5 RW4 RW3 RW2 RW1 RW0
MSB LSB
A register is selected when the corresponding bit is 1 and deselected when the bit is 0.
: Highest bitMSB
: Lowest bitLSB