Hi all, I am a newbe, so sorry if my question to this forum might be totally misplaced. What I have got: I got an ATMEL 89C51CC01UA-IM controlling a device. I also have a Windows-Software communicating with the controller via RS-232 with my own protocoll. What I want to do: I want to flash the microcontroller from within my own Windows-Software (just like the FLIP-Software). I found an ATMEL Paper (ANM088) "In-System Programming - Serial Protocol Stack for C51 Products" which explains the protocol. My problem is, I don't understand too much of this paper. Can some1 help me? Maybe some1 has dealed with the same problem. Thanks, Joerg.