Also you can do this:
<pre>
mov r7, p2
cjne r7, #0, notmode0
;insert mode 0 here
notmode0:
djnz r7, notmode1
;insert mode 1 here
notmode1:
djnz r7, notmode2
;insert mode 2 here
notmode2:
djnz r7, notmode3
;insert mode 3 here
notmode3:
djnz r7, notmode4
;insert mode 4 here
notmode4:
... and so on


Peter