input:
A = 指令種類 (00~08)
B = 指令內容
output:
no return
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PARMSET:
PUSH P1
SETB P3.2 ;DIEN
MOV P1,#LCDSEL
MOV DPTR,#LCDIR ;INDEX REG.
MOVX @DPTR,A
MOV DPTR,#LCDP ;PARAMETER REG.
MOV A,B
MOVX @DPTR,A
POP A
ORL A,#0F0H
MOV P1,A
RET
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