Hi Silviu.

<<<<You come in CICLO routine with R0 loaded with 41H. Why after INC R0, you test CJNE R0,#BH,CICLO2 ?. I mean, why #BH ? >>>>

Well I set this as a "break point" so if the data finishes the parameters after this instruction will reset the byte to the first one.

<<<-Im trying to build a program who sents a set of bytes via one pin of the P1-
I'm wonder which bit on P1 are you concerned since you use MOV P1,A after every rotate. >>>

I want to send all bits one by one trough the port p1.0, and after I finish sending the first byte I will start again with the second byte.

About the DB instruction I will test it today, thanks for your help, You gave me very valuable information!!!! :)

Pd.- If you have more suggestions, I'm open ears (eyes in this case).

Heck! this forum is improving my learning curve!!