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Problem with writing certain SCU registers

Question asked by Torbjørn Tvermosegaard on Oct 24, 2016
Latest reply on Oct 26, 2016 by Torbjørn Tvermosegaard
  • Comment • 4

Using a LPC4357 I am trying to configure P9_3 to have MCOA0 function.
If I write to the configuration register 0x40086000+0x49C it seems to have no effect I read back all zeros, but if I do the same for another pin (0x40086494) the change takes effect and I read back the correct value.
What can cause this behavior?

Kerry Zhou
Kerry Zhou Employee Oct 25, 2016 11:00 PM
Correct Answer

Hi Customer,

    Thank you very much for your detail information.

     I think your problem is caused by the LPC4357 user manual error.

    I check it again, I have found the address for SFSP9_3 is 0x40086000+0X48C, not like the document mentioned 0X49C, actually 0X49C is reserved:

 

   I have do the testing on my MCB1758 with LPCXpresso IDE, the debug interface also shows the address for P9_3 is 0x4008648c.

 

    So, please change the P9_3 address to 0x4008648c.

   I will report this document to our according department immediately, the problem will be fixed in the next doc reversion.

   Thanks a lot for your good question and sorry for the inconvenience we bring you.

 


Have a great day,
Kerry

 

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