Ok
before anything excuse me if my english is so bad.

P1 is common for all 74374 inputs
P2.0 is for the first latch clock, P2.1 is for second and..
when i want to opening the first,
I load 00000001b in P1 and then send
a low to high pulse in p2.0
There for all of latch is driven independently
four 74ls244's is connected to latch's output
for each door state there is a sign in lcd
when system is restarted this question appears on lcd:
do you want to keep previous state?
if yes then previous state before faulting supply or restarting
is happened,else all states are closed.
for both of them, system works properly and then go to the stand by mode
in this mode, time,calendar,temperature and all door's state are shown
if user presses enter key then this message is appear

Enter user name:

but my problem is here:

if Esc key is pressed for going back to the stand by mode
a high to low pulse is generated in P2.0,P2.1,P2.2 and p2.3
with small duration
Question:
According to the source code this pulse must doesn't occur.
why?

Thanks for your time.
Regards
Mehdi