Content originally posted in LPCWare by tvink on Fri Mar 20 07:42:28 MST 2015
Thanks,
I had misunderstood how the pull up and pull downs work in the SFSP registers. I had thought PU/PD were only available when the pin is configured as a GPIO. But I now see that the resistors are available for all of the functions. Good to know!
Anyway, my question really is "what is the polarity of the USB_PWR_FAULT signal". ( Active high or active low ) The LPC users manual doesn't really say. But the literature for the chip on the LPC1830 Explorer board says active LOW. So I was happy with that until I noticed the schematic for the eval board. Since they add a fairly strong pull down resistor I would expect the USB0 to always register a fault. Maybe this is just a simple mistake in the schematic. But if not I am backwards... so I would like to know before I fab my board.
Thanks again...