TMS320F280049: why the XRSn will be driven low every 15ms?

Aki Li

Part Number: TMS320F280049

Customer found the XRSn pin of new devices would be driven low for 50us at every 15ms. After flashing with the emulator, XRSn will keep high normally. Could you please help explain the reason? Thank you.

over 5 years ago

0 Hareesh Janakiraman over 5 years ago

TI__Guru* 95315 points

Aki,

It is the watchdog timing out. You will see this on any part that has a blank (erased) flash. The WD counter keeps overflowing and resetting the part. The code you put in flash either disables the WD or services it periodically and that is why you don't see the periodic resets anymore.

0 Aki Li over 5 years ago in reply to Hareesh Janakiraman

TI__Genius 9915 points

Hareesh,

Thank you. One more question, how can the debugger stop the reset when flashing the device. We saw XRSn was pulled high during the flashing. Could you please share more details for the internal control logic?

0 Aki Li over 5 years ago in reply to Aki Li

TI__Genius 9915 points

And is it a common feature for all C2000 devices?

0 Hareesh Janakiraman over 5 years ago in reply to Aki Li

TI__Guru* 95315 points

how can the debugger stop the reset when flashing the device. We saw XRSn was pulled high during the flashing. Could you please share more details for the internal control logic?

Once the debugger takes control of the device, the device is "stopped in its tracks". i.e. the device operation comes under the control debugger, for the most part (unless you choose the "Run Free" option of the debugger).

And is it a common feature for all C2000 devices?

Yes.

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TMS320F280049: why the XRSn will be driven low every 15ms?