I designed ADuC847 control board. I tried to download firmware to the board. I did set the microcontroller in download mode, but I got the message from WSD: "Failed to connect to the ADuC8xx after 2 attempts" I used oscilloscope to monitor the RXD and TXD signal, I got nice RXD signal from computer, but no TXD reply (always 5V). Is is possible the new microcontroller does not have boot loader? Thanks for the help.