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MOV DPTR, #0003h ; 03h - address of control register
MOV A, #10000001b ; Group A & B as outputs..C as required..
MOVX @DPTR, A
MOV DPTR, #0000h ; Address of port A
MOV A, #01h ; Only Bit0 is H..
MOVX @DPTR, A
MOV A, #11111110b
INC DPTR ; set PB as 11111110b..
MOVX @DPTR, A