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Can not program device

Sergy

Hi,

I have 2 pins that connected to transistors that turn on high-side FETs. One turns on 3.3v for the rest of the system and another one 4v.

When I turn on 3.3v everything is fine, but when I turn on 4v I can not reprogram device anymore in Keil - says Device not found.

4v lines (controlled by P0.05) do not even cross SWCLK or SWDIO lines. What could be the problem?

Device continues to operate properly, just cant do anything with the debugger.

Also eventually after a while i can reprogram the device (after i completely power it off, disconnect JTAG and UART-USB!!!).

Any idea what could be the problem?

Thanks!

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    There is no reset happening during the normal operation, but may be in debug there are some special conditions that trigger it?

    Ive submitted schematics and layout via support page. SWD pin traces are pretty long indeed. We are working on adding bigger capacitor, but that was to pass a CE requirement, it might help overal system stability as well, Ill keep you posted.

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  • 0

    There is no reset happening during the normal operation, but may be in debug there are some special conditions that trigger it?

    Ive submitted schematics and layout via support page. SWD pin traces are pretty long indeed. We are working on adding bigger capacitor, but that was to pass a CE requirement, it might help overal system stability as well, Ill keep you posted.

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