Hi,
I am using a LPC2138 in my project. From this microcontroller I use both AD converters. The problem I have:
channel 6 and 7 from AD0 are not working (I read the value 0 from the ADC).
Other channels (0 to 4 of AD0) are working properly. Also AD1 is working properly. I checked the PINSEL registers and these are correct. What could cause the problem? Any ideas
TIA, Frank
Solution was to pull P0.31 high during reset. According to the manual a low signal on this pin during reset will disable JTAG (which I don't use). According to the errata a low signal on this pin during reset will result in undetermined device behavior.
Thanks for the follow-up. That's a curious little bit of undocumented behavior.
Eric
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