HI Mr. Steiner & all too. Sorry I MISS a statement after the instruction
MOV IE,#90H
SJMP $ this is the missed instruction
...........
but even with this correction, I don`t see nothing.
The point is I copied this program from THE 8051 MICROCONTROLLER by I. Scott Mackeanzie, pag 110. I suppose is ok becasue it runs on my simulator, this program send to SBUF ASCII characters. Mr Mackenzie says ISR is terminated by RETI instruction. The point is, why if I am sending characters to serial port (P3.0 & P3.1 RXD & TXD) I can not see them if I can see signals on P0 or P2 ?
If anyone wish the program to runs on your own simulator just e-mail me to maumana@hotmail.com