I have tested the PCF8563 again. Inserted some code to the firmware to see the operation. The PCF8563 does not work. After sync (and stopping sync), it jumps back an hour, then starts to go backwards. (or something like that). I have replaced the chip from the same batch, same results. Then I purchased it from an other source, still it works in the same way.
It has nothing to do with Opensprinkler code or hardware.
So I replaced to DS1307 and that works fine. (VCC is 3.3V)