2015-04-21 07:38 AM
On startup does the BOOT0 input have a default pull up/down resistor if not connected?
2015-04-21 01:28 PM
Not sure it's specified, what does the volt-meter say?
You'd really want a way of strapping it high or low.2015-04-21 04:07 PM
Gary:
BOOT0 is not specified as having a pull-up or pull-down, so it likely does not. Also, the Hardware ''Getting Started'' application notes connecting the BOOT pin(s) to either 0V or Vdd via a resistance, never leaving them floating. This has lead me to always treat them as a high impedance CMOS input, which should aways be referenced to known high or low logic level. Some of the ST example boards use a 10K or 22K resistor to ground and allow the BOOT pin(s) to be high via jumper or another device's GPIO pin. I've run the F303 BOOT0 pin this way from a F407 that reprograms the F303 in my application. -Patrick2015-04-22 03:02 AM
OK - thanks.
I'll tie it low - forgot to connect it on PCB