I/O pin functionality is a function of the processor. Not the board. Gerald
On Mon, Sep 7, 2015 at 10:05 PM, rattus <[email protected]> wrote: > On Monday, September 7, 2015 at 6:52:12 PM UTC-6, Graham wrote: >> >> Well, by definition, the boot programming pins are going to have the >> pull-ups / pull-downs, so you know what they are going to be doing, until >> over-ridden. >> >> Most processors start up with the programmable pins as inputs, then move >> to the configured state. >> > > If it were so... but it seems with such an abundance of modes and pins, a > number of the pins I am using are in a variety if input, output, hi-Z and > I/O defaults at powerup, most often with pullup or pull-downs. The good > news is, I've added enough gating and the additional fast-starting Vdd to > avoid conflicts. SPI attached peripherals (powered early) all need commands > shifted in to drive outputs, so that's safe too. > > Now for the *next* Beaglebone, innocuous I/Os would be a great feature... > > Anything else can be dangerous to the pins. But, as Charles says, RTFM. >> > >> If you are concerned, use the bus-isolation /transmission-gate chips, >> power them early, supply your own pull-ups/pull-downs, and switch the >> connection on when SYS_RESETn goes high. Then you are unconditionally >> safe, and in-control. >> >> --- Graham >> > > Thanks, > > Mike > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- Gerald [email protected] http://beagleboard.org/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
