topic Re: Boot pins on the LPC4370 in LPC Microcontrollers

Boot pins on the LPC4370

lpcware — Wed, 15 Jun 2016 19:13:13 GMT

Content originally posted in LPCWare by JohnR on Wed Oct 22 09:22:17 MST 2014
Hi,

The 100 pin version of the LPC4370 does not have a lot of user I/O, so if possible I would like to reuse the BOOT pins after startup.

On the LPCLink2 card, after bootup the BOOT0 pin is reused to control the on-board LED.

On a new LPC4370 board design, can BOOT1 and BOOT3 be similarly repurposed after bootup?

BOOT2 is a little more complicated. Can the single jumper be replaced by a two-way jumper - one side to ground via a resistor the other to VCC via a resistor depending on the boot mode (USB0 or SPIFI) to be used?

Thanks in advance for any help,

JohnR.

Re: Boot pins on the LPC4370

lpcware — Wed, 15 Jun 2016 19:13:14 GMT

Content originally posted in LPCWare by mch0 on Wed Oct 22 11:13:08 MST 2014
Hi,

why not?At this moment I just don't see what worries your.
In case you really want to maintain a jumper, you can probably save one of the resistors.
I'd use a single series R (say 4k7) and then connect the selector (3pin) directly to GND/VCC on the "far" side of the R.

Mike

Re: Boot pins on the LPC4370

lpcware — Wed, 15 Jun 2016 19:13:14 GMT

Content originally posted in LPCWare by JohnR on Wed Oct 22 11:35:15 MST 2014
Hi Mike,

Thanks for the reply.

Quote:

I'd use a single series R (say 4k7) and then connect the selector (3pin) directly to GND/VCC on the "far" side of the R.

That's what I have done,

JohnR