programming in 89c51 ,........ interrupt based

[muralistarshine]

org 00h;
ljmp main;
org 0003h
setb p2.0;
RETI;
org 0013h;
clr p1.0;
reti;
org 0030h;
main:
mov IE,#10000001b ;
mov p3,#00h;

clr p2.0;
here: sjmp here;

end;

i have worked out this in proteus software .....it has been build successfully but it cant give desired output ....
could anyone chalkout mistake in above programmmmmmmmmmm

 

[Wond3rboy]

To enable both external interrupts IE should be 10000101 B You have made port3 an output where as to detect interrupts it should be configured as an input.

 

[muralistarshine]

i have changed port 3 to input and ie value too but there is output at p2.0 without any interrupt whats the problem?
how to rectify it?

 

[muralistarshine]

To enable both external interrupts IE should be 10000101 B You have made port3 an output where as to detect interrupts it should be configured as an input.

i made it as per ur suggestion i.e to make p3 an input port and ie value tooo
still i am getting p2.0 =1 and without any interrupt at p3.2 ........what can ido to rectify this problem??????

 

[Wond3rboy]

The interrupts need a pull up.Change your code
"
here: sjmp here;

end; "

to this to see the change:


here:
CLR P2.0
sjmp here;

end;