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Connecting I/O pins directly to ground

md1
Associate II
Posted on June 20, 2006 at 13:39

Connecting I/O pins directly to ground

2 REPLIES 2
md1
Associate II
Posted on May 17, 2011 at 09:30

The ARM9 datasheet recommends connecting unused I/O pins to ground (rather than through resistors?).

There could be a situation where the software engineer incorrectly configures an I/O pin (it happens :) ) to output mode.

Can these I/O pins not be set to output mode in software at startup. I know there is small period of time at startup when the I/O's are not configured, and could be susceptable to noise. Is there more danger of the core being upset due to noise on the STR9?

Thanks,

Marty.

halim
Associate II
Posted on May 17, 2011 at 09:30

Hi

I suggest to use pull-down resistor and not to connect unused pins to ground directly

best regards,

Punto