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[Dude] Running SAMD21G18 at 1.8v
grafi:
My programmer can not work at 1,8v. The interface works at 3.3v. When i set the vcc to 1.8v the debug interface not run (in 3.3v works well and i can debug).
ataradov:
Can you vary voltage slowly? What is the voltage at which it stops working?
I would starts with a very simple project that does not initialize anything fancy. My starter project would work https://github.com/ataradov/mcu-starter-projects/tree/master/samd21 . Just change the LED pin assignment.
grafi:
At 2.1v works well and when i set 2.0v not work. I have used my code, running a 48mhz and i havent modified any wait state value. Datasheet said that the ucontroller can work at 1.65v.
I will test your code later.
thanks,
Regards.
ataradov:
There are a couple more things you can do:
1. When running from 3.3 V where you have ability to debug, have a look at the value of the SYSCTRL.BOD33 register. Is ENABLE bit set? This register is loaded from the Use Row on reset, but may be later overwritten by the firmware.
2. See if your debugger works at 2 V, you may be able to debug thew "stuck" case this way.
grafi:
Register BOD33 with VCC=3.3v and code paused after execute few lines. BoD33 register is set to 0 (disabled).
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