Hi ,
I'm facing problem with external interrupts of 89C51
Both the external interrupts i want for edge trigger.
I'm applying clock on both of the INT0 and INT1 pin
I'm getting sharp pulse on P2 at the falling edge of the
clock it means INT1 is working for edge trigger But for
INT0 I'm getting many transitions on P0 during the low clock period
This shows INT0 is working as level trigger.
Both of the External Interrupts can be made edge trigger on not ?
Can anybody suggest me any solution to this problem ?

following is the assembly code :
<pre>
org 0h
ljmp main
org 03h
mov P0,#00h
reti
org 13h
mov P2,#00h
reti
org 100h
main: setb IE.0 ;enable INT0
setb IE.2 ;enable INT1
setb IE.7 ;enable intr flag
setb IE0 ;edge trigger INT0
setb IE1 ;edge trigger INT1
st: mov P0,#ffh
mov P2,#ffh
sjmp st
<pre>

thanks
Sanjay