Hi Adrien, There are several weird issues here... [quote userid="455399" url="~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1494377/tms320f28388d-jtag-issue---can-t-connect-to-target/5747149#5747149"]Following up with the flowchart, I tried to measure the oscillator frequency and amplitude, and got nothing. And that's where I think I found the problem.[/quote] This is certainly an issue, but an unprogrammed MCU will only use internal oscillator, so this would not cause your other issues. [quote userid="455399" url="~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1494377/tms320f28388d-jtag-issue---can-t-connect-to-target/5747149#5747149"] - XRSn is also nice and stable, but around 0.9V. This might be the issue (app note says should be high), however the recommendation is to check the boot pins, which are both pulled up with 10k resistors[/quote] To me, this sounds like the biggest problem. XRSn voltage should not settle at 0.9V. Can you check the value of your XRSn pullup resistor to make sure that it hasn't been populated incorrectly? Can you share the schematic of your XRSn circuit? Thanks, Ben Collier
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