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    analog comparator pin assignment

    • Ken4147
      Posted by
      on Jan 05 2010 01:01 AM
      Intellectual410 points
      Hi, All,

      From LM3S9B96's datasheet, I saw that on page 1107, table 25-4, the analog comparators column.

      I'm not much familiar with analog comparator, therefore I have a question maybe not a question:

      Since once C2+ and C2- were used, as analog inputs. If I want the result output however, the C2o pin and C2+ pin are co-pins, how can I retrieve the result?

      For the answer, if someone know about which explicitly described in the datasheet, just respond y to me and I'll check it out by myself.

      Thanks in advance.
      Report Abuse
    • Stellaris Paul
      Posted by
      on Jan 05 2010 17:12 PM
      Expert8170 points
      You have to check "Table 9-2. GPIO Pins and Alternate Functions" to find another pin that has C2o to use it at the same time.

      C2o is also on PE7 and PC6
      C2+ is only on PC6.
      C2- is only on PC7.

      Code:


       
      //
      // Enable C2o functionality on Port E pin 7. 
      //
      GPIOPinConfigure(GPIO_PE7_C2O);
      GPIOPinTypeComparator(GPIO_PORTE_BASE, GPIO_PIN_7);




      Report Abuse
    • Ken4147
      Posted by
      on Jan 05 2010 21:48 PM
      Intellectual410 points
      TI Paul wrote:
      You have to check "Table 9-2. GPIO Pins and Alternate Functions" to find another pin that has C2o to use it at the same time.

      C2o is also on PE7 and PC6
      C2+ is only on PC6.
      C2- is only on PC7.

      Code:


       
      //
      // Enable C2o functionality on Port E pin 7. 
      //
      GPIOPinConfigure(GPIO_PE7_C2O);
      GPIOPinTypeComparator(GPIO_PORTE_BASE, GPIO_PIN_7);









      So, my question would be...

      Let's conversely ask about, since C2o is also on PE7 and PC6, then when I decide to choose PC6 to use as output,
      how it works? PC6 becomes either input or output?

      Thanks.
      Report Abuse

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