I have migrated from p89c51rd2 to p89v51rd2.i am trying to do iap using the following code:
ORG 03000H
MOV IE,#00H
HERE: JB P3.0,HERE
SETB P2.0
SETB P2.1
LCALL WRITEM
SETB P2.2
THERE: JB P3.1,THERE
MOV A,#00H
MOV DPTR,#0F000H
MOVC A,@A+DPTR
MOV P1,A
MOV P0,A
NOWHERE: LJMP NOWHERE
WRITEM: MOV R1,#02H
MOV DPTR,#05000H
MOV A,#019H
LCALL 01FF0H
WRITEM1 CJNE A,#00H,WRITEM1
RET

My program doesnt function as required
P2.0 and P2.1 become set for a short priod of time and again get cleared where as p2.2 doesnt change status atall.
i use 12Mhz crystal and 1uF/10k for reset ckt
please verify my code and give me sme suggestions
regards
harshada