bogachan karayigit wrote:
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1) i make port3 ffh again...


No, because you are writing to the OUTPUT registers.

2)another help about register banks...is it necessary to select one of them at the begining or if no bank selected...the microcont. use bank0 as default...


Think it defaults to 0.

3)is there any command to end the program like hlt....or is it suitable to use infinite loop....


There is no HALT instruction. You could put the chip into its power down mode though.
4)is it possible to call a subrt. in a subrt.

Yes.
Steve