Thanks so much for all people that answer me. !!!!!!

Dear Oleg.
The: http://www.atmel.com/dyn/resou...oc4348.pdf
shows examples for AT89C51SND1 not for AT89S8252 in fact it differs, in the SPI name registers, and the SND1 SPI port is a little bit different, correct ?

The:
http://www.atmel.com/dyn/resou...OC1018.PDF
Shows examples for master with an eeprom as slave.....just my problem is in my AT89S8252 slave, i can't found any in that doccument.

Oleg...I'b been found that all doccuments before.
but... about not to do a loop into the ISR, I think is a good point, the question is:
How to check for SPIF set, without doing that into the ISR?
Be quiet...I know what you want to say about handshake, is very commonly for me, to use it in serial port comunications.

Thanks again and regards.