NEC PD17062 - Manual (Page 92)

92
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PD17062
10.3.2 Example Table Referencing Program
This section shows an example table referencing program.
Example
P0A MEM 0.70H ;
P0B MEM 0.71H ;
P0C MEM 0.72H ;
ORG 0000H
START :
BR MAIN
DATA :
DW 0001H ; Constant data
DW 0002H ;
DW 0004H ;
DW 0008H ;
DW 0010H ;
DW 0020H ;
DW 0040H ;
DW 0080H ;
DW 0100H ;
DW 0200H ;
DW 0400H ;
DW 0800H ;
MAIN :
BANK0 ; Built-in macro
SET4 P0ABIO3, P0ABIO2, P0ABIO1, P0ABIO0
SET4 P0BBIO3, P0BBIO2, P0BBIO1, P0BBIO0
MOV RPL, #1110B ; Sets general-purpose register to row address 7H of BANK0 .
MOV AR1, #(.DL.DATA SHR 4 AND 0FH)
MOV AR0, #(.DL.DATA SHR 0 AND 0FH)
; Sets address register to 0001H.
LOOP :
; #
MOVT DBF, @AR ; Transfers the contents of the ROM specified by AR to data
; buffer.
;
$
LD P0A, DBF2 ; Transfers the contents of data buffer to Port0A (70H),
LD P0B, DBF1 ; Port0B(71H), and Port0C (72H) port data registers.
LD P0C, DBF0
ADD AR0, #1 ; Increments the contents of data register by one.
ADDC AR1, #0
SKNE AR0, #0CH ; Writes 0 in AR0 when the value of AR0 reaches 0CH.
MOV AR0, #0 ;
BR LOOP