topic Re: PDRUNCFG in LPC Microcontrollers

PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:23 GMT

Content originally posted in LPCWare by IanB on Fri Feb 19 05:57:40 MST 2016
What does bit 0 (IRC oscillator output) actually do, that makes it different from bit 1 (IRC oscillator)?

I mistakenly assumed that it was for the CLKOUT pin, and as I wasn't using the CLKOUT pin I switched it off, and it really didn't like being switched off!

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:24 GMT

Content originally posted in LPCWare by IanB on Sun Mar 27 14:34:17 MST 2016
So, does nobody know?

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:24 GMT

Content originally posted in LPCWare by starblue on Sun Mar 27 23:54:54 MST 2016
It could help if you tell us what you are talking about (which register, which MCU).

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:25 GMT

Content originally posted in LPCWare by IanB on Mon Mar 28 00:54:38 MST 2016

Quote:
It could help if you tell us what you are talking about (which register, which MCU).

1. The PDRUNCFG register (hence the title)

2. The LPC11xx MCU (hence this section of the forum) but the LPC8xx, LPC13xx and LPC15xx are the same.

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:25 GMT

Content originally posted in LPCWare by IanB on Sat Apr 02 01:13:27 MST 2016
So nobody knows what it does, then? Not even somebody at NXP?

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:26 GMT

Content originally posted in LPCWare by IanB on Wed Apr 06 13:50:49 MST 2016
How do I get someone at NXP to pay attention and answer the question?

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:27 GMT

Content originally posted in LPCWare by TheFallGuy on Wed Apr 06 14:46:14 MST 2016
Try the NXP support?
https://nxpcommunity.force.com/community/communityLogin?pagename=communityContactSupport

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:27 GMT

Content originally posted in LPCWare by IanB on Thu Apr 07 02:34:10 MST 2016
Unfortunately, I have just found that NXP restricts access to support to PC users and excludes those with Macs. The registration form doesn't work in Safari.
I thought I'd contact the webmaster to tell him, but first I have to register!

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:28 GMT

Content originally posted in LPCWare by af_bln on Tue Apr 19 23:51:35 MST 2016
I would say
0 IRCOUT_PD IRC oscillator output power-down ===== disables the output amplifier after the oscillator stage
1 IRC_PD IRC oscillator power-down ===== disables the supply of the internal oscillator

Re: PDRUNCFG

lpcware — Wed, 15 Jun 2016 19:26:28 GMT

Content originally posted in LPCWare by IanB on Wed Apr 20 00:43:34 MST 2016
Thanks. That makes a bit more sense of it, and explains why it all goes horribly wrong if I disable IRCOUT when I'm using the oscillator.
Probably, it's best if I don't start to wonder why anyone would want to enable or disable one without the other.