SONIX SN8P2624 - Page 17

SN8P2624
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 17 Version 0.3
¾ Example: Modify above example by “INC_YZ” macro.
B0MOV Y, #TABLE1$M ; To set lookup table1’s middle address
B0MOV Z, #TABLE1$L ; To set lookup table1’s low address.
MOVC ; To lookup data, R = 00H, ACC = 35H
INC_YZ ; Increment the index address for next address.
;
@@: MOVC ; To lookup data, R = 51H, ACC = 05H.
… ;
TABLE1: DW 0035H ; To define a word (16 bits) data.
DW 5105H
DW 2012H
…
The other example of loop-up table is to add Y or Z index register by accumulator. Please be careful if “carry” happen.
¾ Example: Increase Y and Z register by B0ADD/ADD instruction.
B0MOV Y, #TABLE1$M ; To set lookup table’s middle address.
B0MOV Z, #TABLE1$L ; To set lookup table’s low address.
B0MOV A, BUF ; Z = Z + BUF.
B0ADD Z, A
B0BTS1 FC ; Check the carry flag.
JMP GETDATA ; FC = 0
INCMS Y ; FC = 1. Y+1.
NOP
GETDATA: ;
MOVC ; To lookup data. If BUF = 0, data is 0x0035
; If BUF = 1, data is 0x5105
; If BUF = 2, data is 0x2012
…
TABLE1: DW 0035H ; To define a word (16 bits) data.
DW 5105H
DW 2012H
…