I assume this is just an example application you want?

Otherwise I'd use a astable-multivibrator to make the LED's flash.

My miniature Christmas tree was very popular last year...

Anyway :-


org 00h

start:

mov r0,#0ffh
mov r1,#0ffh
setb p2.0
l1:
djnz r1,l1
djnz r0,l1
clr p2.0

mov r0,#0ffh
mov r1,#0ffh
setb p2.3
l2:
djnz r1,l2
djnz r0,l2
clr p2.3
jmp start





something like that should do it, it depends on your clock speed of course....

Did you want source, or HEX format?


Chris.