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MSP430F2274: Read/Write register can't be read ( Port 2 on MSP430F2274)

Andrew Barnes
Intellectual 600 points
Part Number: MSP430F2274


I am having some issues with MSP430F2274 debugging.  I have code which correctly writes data to P2IE but when I inspect the P2IE register the value is always zero.  I know the value was correctly written because when I assign it's value to a variable the value is set as expected.  I looked up the P2IE register in the data sheet and it says it is read/write but I also see that the data sheet says  ...

     Because there are only three I/O pins implemented from port P2,

     bits [5:1] of all port P2 registers read as 0, and write data is ignored.

Now when I look at the part it has all 8 bits for P2 defined which can all be IO or something else. 

So, any ideas on why I can't see the register value update?

I'm using IAR 7.10

  • 0
    TI__Guru 52040 points
    Hello Andrew,
    I just received your question. Could you share the code please?
  • 0 in reply to Nima Eskandari
    TI__Guru 52040 points

    Andrew,

    I just did a quick example on IAR and I am not able to see your issue.

    I ran the example below,

    #include "io430.h"

unsigned char p2ieRead = 0;

int main( void )
{
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  P2IE = 0xFF;
  p2ieRead = P2IE;
  p2ieRead++;
  while(1);
  return 0;
}

    The debugger window looks like this before read/write,

    After the write to P2IE,

    and finally after reading it back,

    please let me know what you would like for me to investigate.

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