@ Skimask:
I read that part. Thats why I put in the programm :OSCCAL.0 = 0

@ Mister_e:
You win the price. That helped.
I read also that the option reg bit 5 should be 0 , but I wrote at that time in my programm OPTION.5 = 0 , and the compile gave me an error. I forgot to type it in the correct way.
Thanks.
Regards
Mat