Hi frnds....I am using a ADuc831 controller, power supply - OK, oscillator - OK , still i am not able to get any response through UART. wat might be the problem...any idea????
PSEN should be help low during power up or hard reset to enable the bootloader.
You should then be able to interrogate the bootloader to see if the processor is up.
Check out Analog Devices Application note AN-1074 for bootloader details.
I couldn't get the HEX file to downlaod to the ADuC831 either with the new Windows Serial Downloader. Everything worked fine when I downgraded to WSD version 6.7 get it here: ftp.analog.com/.../ Hope this helps.