74LS123 PWM Motor Control problem

Discussion in 'The Projects Forum' started by nenadilic84, Nov 6, 2009.

  1. nenadilic84

    Thread Starter Active Member

    Aug 7, 2009
    62
    0
    Hi All,
    I'm tiring to simulate a PWM circuit in Proteus, attached below. The problem is that simulation does not work. This is the message I get "Pin 'Cx' is not modelled". I'm new to Proteus. Thanks in advance.

    Nenad
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Probably you didn't set the TRISC register to indicated if port C is an input or output.
     
  3. nenadilic84

    Thread Starter Active Member

    Aug 7, 2009
    62
    0
    No, every port is defined, but still I get this message after finishing the simulation....
     
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