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WSD Failed to connect to the ADuC847 afer 2 attempts (urgent)

Question asked by David_ODI on May 19, 2014
Latest reply on May 21, 2014 by David_ODI


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.