topic Re: LPC11A14 HVQFN 33 package - I/O in LPC Microcontrollers

LPC11A14 HVQFN 33 package - I/O

lpcware — Wed, 15 Jun 2016 19:41:29 GMT

Content originally posted in LPCWare by John@MPL on Thu Nov 07 10:49:37 MST 2013
I am using the 33 pin version of the LPC11A14 and cannot configure PI00_2 and PIO0_3 as outputs.
I am also using PI00_1 and PIO0_4 which work fine as I/O pins. (being used as a 4 to 16 decoder)
I have used LPC_IOCON->PIO0_2 &= ~0x07; to set as an I/O port as I have PIO0_3 but refuse to work as I/O.
I use GPIOSetDir and GPIOSetBitValue to configure direction and set output.
These 2 pins can be used as alternative SWDIO and SWCLK pins.
Am I missing something.

Re: LPC11A14 HVQFN 33 package - I/O

lpcware — Wed, 15 Jun 2016 19:41:30 GMT

Content originally posted in LPCWare by capiman on Thu Nov 07 11:03:32 MST 2013
I think they are open drain.
Have you tried an external pull-up resistor?

Re: LPC11A14 HVQFN 33 package - I/O

lpcware — Wed, 15 Jun 2016 19:41:31 GMT

Content originally posted in LPCWare by LabRat on Thu Nov 07 11:05:31 MST 2013
UM10527:

Quote:
The pins are [color=#f00]true open-drain[/color] for all pin functions.

Re: LPC11A14 HVQFN 33 package - I/O

lpcware — Wed, 15 Jun 2016 19:41:32 GMT

Content originally posted in LPCWare by John@MPL on Thu Nov 07 11:17:38 MST 2013
Thanks capiman.

You are quite correct ... difficult to get resistors on TTSOPS but works.
Can they be configured as Totem ?

Thanks.

Re: LPC11A14 HVQFN 33 package - I/O

lpcware — Wed, 15 Jun 2016 19:41:32 GMT

Content originally posted in LPCWare by LabRat on Thu Nov 07 11:25:44 MST 2013
No.

UM10527:

Quote:
The pins are [color=#f00]true open-drain[/color] for all pin functions.

Re: LPC11A14 HVQFN 33 package - I/O

lpcware — Wed, 15 Jun 2016 19:41:33 GMT

Content originally posted in LPCWare by John@MPL on Thu Nov 07 11:28:44 MST 2013
Thank All ... Just read UM10527 ... 6.4.1.2