1. At last, how much memory(internal, data and code) have this microcontroller ? 64+2+2+2 KB or only 64KB wich include bootloader and (2KB ERAM wich include EEPROM)!!! ?
wrong question, your question assumes vonNeumann, the '51 is HARVARD
the answer
64k code memory, 2K of which may be switched to Boot Flash Memory
256 bytes of IDATA 128 of which are also DATA and 2k (internal) XDATA
a 2k SERIAL EEPROM

2. If i boot with a bootloader, code for my program is stored in flash memory or in EEPROM or in both?
Flash ONLY

3. In boot flash memory i have API for boot and use in program by default from Atmel or i need to write my API for this?
from ATMEL NOTE two versions exist, the code on the chip tell which (look it up in the datasheet)

4. Can i know where in program memory will store some instructions ?
The linker will tell you

5. How can i know where i write my code ?
at your desk, I assume :)
answered in 1)

Erik


All this things make me confused.

You need to stop everything and read 'the bible' clearly you have no idea of the amny things that are unique to the '51

here are the links to "the bible"
Chapter 1 - 80C51 Family Architecture:
http://www.nxp.com/acrobat_d...ARCH_1.pdf

Chapter 2 - 80C51 Family Programmer’s Guide and Instruction Set:
http://www.nxp.com/acrobat_d...UIDE_1.pdf

Chapter 3 - 80C51 Family Hardware Description:
http://www.nxp.com/acrobat_d...WARE_1.pdf