Hi, Aman:
Thanks for your replying.

I use the same port as you. INT0 connect to Clock line. Data line connect to port1.

What I have done is:
clear clock line
delay 100us
clear data line
setb clock line

I think at this time, the keyboard will start generating clock pulse automatically, but I cann't get any pulse generated by keyboard. Any idea about this?
Thanks

Frank