?Type of DAC in MK22FX512A uP

[michaelhuslig]

K22P144M120SF5V2RM.pdf, dated Mar 2015, Revision 5, says that the 12-bit DAC has only 2 12-bit data registers, DAT0L/H and DAT1L/H.  The RM also has references to 16 data registers that were probably left over when the RM was edited.  However, when trying to port my DAC code from the TWR K40, which worked with the 16 data registers, it also works in the MK22FX512A.  And the debugger sees all 16 data registers, DAT0L/H thru DAT15L/H.  Is the RM wrong?  Or should I not be using all 16 data registers?

[Alice_Yang]

Hello Micheal,

I think this is a bug or some simple write on the K22P144M120SF5V2RM.pdf, dated Mar 2015, Revision 5,.

For we can see that , when we create on project about this chip , there will 16 DATA registers , and aslo

in the old version , for example :

Document Number: K22P144M120SF5RM

Rev. 3, April 2014

it list all of them :

And in the new version , we can see the memory of DATA2-DATA15 have not been occupied by other register .

So i this the DAC of this K22 chip have 16 DAC_DAT registers.

Hope it helps

Have a great day,
Alice Yang

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[michaelhuslig]

Alice,

Note that the two RMs you mention are for different chips.  I am using the MK22FX512AVLQ12 for which the ...V2RM.pdf is supposed to cover.  The other RM does not cover the 'A' version of the uP.

Surely someone at Freescale/NXP knows whether the V2RM.pdf is in error.

[jeremyzhou · Accepted solution]

Hi Micheal,

First off, I'd like to apologize to you for misunderstand your question.

I've confirmed that the MK22FX512AVLQ12 contains the 16 data registers and I'll report this doc error to the Document team for checking.

Hope it helps.
Have a great day,
Ping

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[jeremyzhou]

Hi Micheal,

The K40 contains the 12-bit DAC module which is as same as the K22's. The DATnL/H provides 16 bit to set the DAC output, however the 7~4 bits of the DAC_DACnH are reserved.

Have a great day.
Ping

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