Hi all

i try to programm a T89C51RD2 from Atmel W&µC over the RS232. I have to send a U to syncronise the baudrate and then i have to send the Intel Hex-File. After about 2 or three lines of the Hexfile the µC seems to desyncronise and the Echos didn't come correctly. The Oszillatorfrequenzy is 8MHz and the Baudrate 9600. Other Baudrates didn't working better. The Software from Atmel (Temic) didn't work correctly too. What can i do?

Matthias