hi why do I need the pullup resistors on P1.0 and P1.1 ?

Is this correct?????

//READ from extern adress
mov R0,ReadAdress setb ALE
mov P1,R0 //write readadress to P1
clr ALE
clr CS
clr RD
mov R1,P1 // read data from P1
setb RD
setb CS
mov ReadData,R1
RET

//WRITE to external adress
mov R0,WriteAdress
mov R1,WriteData
setb ALE
mov P1,R0 //write extern adres to P1
clr ALE
clr CS
clr WR
mov P1,R1 //write data to P1
setb WR
setb CS
RET