5v tolerant inputs on lpc1769

[lpcware]

Content originally posted in LPCWare by dragilla on Fri Jan 13 07:53:10 MST 2012
Hello,

I know I/O's are 5V tolerant in lpc1769. But in the UM there is this sentence:
"Crystal pins, power pins, and reference voltage pins are not 5V tolerant. In
addition, when pins are selected to be A to D converter inputs, they are no longer 5V tolerant and must be limited to the voltage at the ADC positive reference pin (VREFP)."

The question is: if I use a pin as CAP input is it 5V tolerant? I'm not sure of the mechanisms of ADC, maybe it is used when CAP is used - also I don't know what's crystal pin (the word crystal appears only once in the UM) or power pin (power supply, vbatt, etc?). Help me out a bit please.

regards,
--
Luke

[lpcware]

Content originally posted in LPCWare by dragilla on Fri Jan 13 10:38:47 MST 2012
Ok. Thank you very much.

[lpcware]

Content originally posted in LPCWare by NXP_USA on Fri Jan 13 10:17:52 MST 2012
Power pins are not 5V tolerant- power pins include all the power pins for the chip such as Vdd(3V3) Vdd(REG)(3V3).
The "Crystal Pins" are pins that you could connect an external crystal to. These include XTAL1, XTAL2, RTCX1, and RTCX2.
The ADC is not used if an I/O pin is used as a capture, it is only used to measure analog voltages.