Hi Hua,
No, the web selection is not correct, LPC4370FET256 can support both 10 bit ADC(ADC0,1) and 12bit ADC, but LPC4370FET100 just can support 12-bit ADC, it doesn't have the 10 bit ADC.
You can find this information in the LPC43xx user manual:
https://www.nxp.com/docs/en/user-guide/UM10503.pdf


Wish it helps you!
Have a great day,
Kerry
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