Which pins do I have to use to program this uC? In datasheet for this uC, I found (on figure 41, page 46) only RS pins correct connected, VPP to 5-12V and VCC 5V. What about rest (PSEN,RESET)? What about P2.6, P2.7, which have to be put on "1" in model HBP. How is it in case P89C51RD2BN processor?
The details are given in the text on page 46 right under the heading "Hardware Activation of the Boot Loader".
Note that not all the information is given in the diagrams. :)