Teensy++, three pins won't go low

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frax

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Hi,

I wanna use the pins called 38-45 (F0-7) on this PDF:
https://www.pjrc.com/teensy/card4b.pdf
as digital output.

pinMode(38, OUTPUT);

and then a simple digitalWrite(38, ... HIGH/LOW blinker works just fine.
38, 39, 40 and 41 all good but 42, 43, 44 and 45 won't go low. They even stay HIGH when I set them as inputs.

Teensy is not connected to anything else.

Is there anything special withe these three pins?
 
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And the suggested
MCUCR = (1<<JTD) | (1<<IVCE) | (0<<PUD);
MCUCR = (1<<JTD) | (0<<IVSEL) | (0<<IVCE) | (0<<PUD);

works perfect, all pins behave as expected now :)
 
Here's a picture of the apparently fake Teensy.

teensy-fake.jpg
 
Yup, that's definitely a counterfeit.

If you bought it within the last 90 days, odds are good you'll get your money back with a complaint.
 
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