ok, really simple, whats wrong with this? According to my oscilloscope it's not switching the the bits on p1 high or low, all I get is 170mV of 'noise'

org 8000H
load

mov p1,#0
mov p2,#0
mov p3,#0

mov r1,#255
mov r0,#255

loop1:
djnz r1,$
djnz r0,loop1

mov p1,#0
loop2:
djnz r1,$
djnz r0,loop2
mov p1,#255
jmp loop1
end