LPC553x: ADC hardware trigger sources

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LPC553x: ADC hardware trigger sources

Senior Contributor I


according to the manual, ADC hardware triggers can be generated from asynchronous input sources at the periphery of the ADC.

The reference manual reads: "The number and sources of hardware triggers implemented is device-specific. See the chip-specific ADC information for descriptions of available hardware trigger sources for this device."

I could not find the information the manual refers to. 

Where exactly is this "chip-specific ADC information" to be found?


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NXP TechSupport
NXP TechSupport

Hello @danielholala,

You could check the "chip-specific ADC information" in the Datasheet and/or the User Manual of LPC553x. In this case, you could look the ADC Hardware Trigger information in the LPC553xRM.

For the number and sources of hardware triggers available, please go to:

  • Section 46.2.2. Features,


[LPC553xRM. Chapter 46. Analog-to-Digital Converter (ADC)]

  • Section 46.1.4. ADC trigger inputs, and


[LPC553xRM. Chapter 46. Analog-to-Digital Converter (ADC)]

  • Section and ADCx Trigger input connections.

Best regards, Raul.

Senior Contributor I

Hello @RaulRomero ,

Thank you for getting back to me.

Let me please repeat in my own words what I learned from your notes:

Using "INPUTMUXER" registers, I route up to four trigger sources to each ADC (e.g., via registers ADC0_TRIG0 - ADC0_TRIG3 for ADC0) selecting from 35 trigger inputs for each trigger source.

Then using "ADC" registers, for each trigger source that I routed above (up to four), I configure the ADC command that is triggered by that trigger source (e.g., via registers TCTRL0 - TCTRL3).

That's different to the LPC552x with regard to routing trigger sources using the INPUTMUXER is not available on the LPC552x.

Did I understand this correctly?


PS: You seem to be looking at a different version of the manual than me. This is what I'm looking at: Rev. 3, 07/2023


and there the ADC section has been moved to chapter 47:


PPS: If the reference manual could be a bit more elaborate instead of trying to be as concise as possible that would help and I would not need to raise these questions here. Nevertheless, I appreciate all the help I receive through the community forum. Thanks.


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