Quick reset and bootload question

russ · ‎2008-09-21

Posted on September 22, 2008 at 08:24

russ · ‎2011-05-17

Posted on May 17, 2011 at 12:45

If I am not utilizing the manual reset input on the processor should I add a pull up resistor on that pin?

Likewise, I am bootloading this processor. Do I need to apply a pull-down resistor on BOOT1 (note: not BOOT0) or can I leave it unconnected?

Thanks in advance.

russ · ‎2011-05-17

Posted on May 17, 2011 at 12:45

Seriously? No one knows the answer to this?

russ · ‎2011-05-17

Posted on May 17, 2011 at 12:45

Tibo, you are right, but what Paul.Archer said worries me. Any second opinions?

paul · ‎2011-05-17

Posted on May 17, 2011 at 12:45

I found that a pull-up was required on the reset line, the micro would not boot without it.

I am not sure about the BOOT1 pull-down, I have one on my board.

tibo · ‎2011-05-17

Posted on May 17, 2011 at 12:45

The NRST pin has an internal pull up resistor with 40K, so I suppose that a pull up

is not necessary (see page 86 in HD Datasheet). The reference design in AN2586

has also no pull up.

If you use only flash memory, I suppose you can use BOOT1 a normal GPIO

(BOOT1 is shared with PB2).

stevemelnikoff9 · ‎2011-05-17

Posted on May 17, 2011 at 12:45

We have pull-downs on BOOT0 and BOOT1, and a pull-up on !RESET.