How to gurantee that LPC1317-64pin don't start operation until high voltage

[lpcware]

Content originally posted in LPCWare by aamir ali on Fri Jan 25 02:42:36 MST 2013
How to guarantee that MCU don't start executing any instruction until proper high voltage reached.

Is it by BOD.

[lpcware]

Content originally posted in LPCWare by graynomad on Sun Feb 10 23:24:03 MST 2013
Personally I would never leave a reset pin floating, even if there's an internal pullup I'd add one, say 10k.

[lpcware]

Content originally posted in LPCWare by aamir ali on Sat Feb 09 05:23:24 MST 2013
What exactly POR do in LPC1317-64P.

Do it reset pin low internally until voltage reached 1.8V + 80us + 101us. (Fig 4, page 35 of UM10524.) & processor execute user code only after :

---

Quote:
Time until voltage reached 1.8V + 80us + 101us + 55us.

---

In my circuit I have left pin reset as open. Is it right or I should pull -it up .

[lpcware]

Content originally posted in LPCWare by Jeroen3 on Fri Jan 25 07:40:11 MST 2013
That is exactly where voltage supervisors (often combined with watchdogs) are useful.
For example this one. (has no watchdog)

[lpcware]

Content originally posted in LPCWare by serge on Fri Jan 25 06:07:33 MST 2013
For BOD to work your MCU must already execute instructions.:eek:

So why not keeping the reset pin ([FONT=Arial][FONT=Arial][FONT=Times New Roman][COLOR=black]RESET_PIO0_0) low until all voltages are ok? :rolleyes:[/COLOR][/FONT]
[/FONT][/FONT]

[lpcware]

Content originally posted in LPCWare by ub3r on Fri Jan 25 04:45:25 MST 2013
Yes BOD.

Put this somewhere in the beginning of your code..

LPC_SYSCON->BODCTRL = 0x13;// BOD LEvel 2.7V