SONIX SN8P2624 - Page 29

SN8P2624
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 29 Version 0.3
) MULTI-ADDRESS JUMPING
Users can jump around the multi-address by either JMP instruction or ADD M, A instruction (M = PCL) to activate
multi-address jumping function. Program Counter supports “ADD M,A”, ”ADC M,A” and “B0ADD M,A” instructions
for carry to PCH when PCL overflow automatically. For jump table or others applications, users can calculate PC value
by the three instructions and don’t care PCL overflow problem.
 Note: PCH only support PC up counting result and doesn’t support PC down counting. When PCL is
carry after PCL+ACC, PCH adds one automatically. If PCL borrow after PCL–ACC, PCH keeps value and
not change.
¾ Example: If PC = 0323H (PCH = 03H, PCL = 23H)
; PC = 0323H
MOV A, #28H
B0MOV PCL, A ; Jump to address 0328H
…
; PC = 0328H
MOV A, #00H
B0MOV PCL, A ; Jump to address 0300H
…
¾ Example: If PC = 0323H (PCH = 03H, PCL = 23H)
; PC = 0323H
B0ADD PCL, A ; PCL = PCL + ACC, the PCH cannot be changed.
JMP A0POINT ; If ACC = 0, jump to A0POINT
JMP A1POINT ; ACC = 1, jump to A1POINT
JMP A2POINT ; ACC = 2, jump to A2POINT
JMP A3POINT ; ACC = 3, jump to A3POINT
…
…