code: /**
   * Copyright (c) 2004-2005, Regents of the University of California
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *
   * Neither the name of the University of California, Los Angeles nor the
   * names of its contributors may be used to endorse or promote products
   * derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package avrora.sim.mcu;
  
  import avrora.sim.*;
  import avrora.sim.output.SimPrinter;
  import avrora.sim.clock.Clock;
  
  /**
   * The <code>InteralDevice</code> class represents an internal device
   * on a microcontroller.
   *
   * @author Ben L. Titzer
   */
  public abstract class AtmelInternalDevice {
  
      public final String name;
      protected final AtmelMicrocontroller microcontroller;
      protected final Simulator simulator;
      protected final AtmelInterpreter interpreter;
      protected final SimPrinter devicePrinter;
      protected final Clock mainClock;
  
      public AtmelInternalDevice(String n, AtmelMicrocontroller m) {
          name = n;
          microcontroller = m;
          simulator = m.getSimulator();
          mainClock = simulator.getClock();
          interpreter = (AtmelInterpreter)simulator.getInterpreter();
          devicePrinter = m.getSimulator().getPrinter("atmel." + n);
      }
  
      protected void installIOReg(String name, ActiveRegister reg) {
          microcontroller.installIOReg(name, reg);
      }
  
      /**
       * Helper function to get a 16 bit value from a pair of registers.
       */
      protected static int read16(RWRegister high, RWRegister low) {
          int result = low.read() & 0xff;
          result |= (high.read() & 0xff) << 8;
          return result;
      }
  
      /**
       * Helper function to write a 16-bit value to a pair of registers.
       */
      protected static void write16(int val, RWRegister high, RWRegister low) {
          high.write((byte)((val & 0xff00) >> 8));
          low.write((byte)(val & 0x00ff));
      }
  
      public Clock getClock() {
          return mainClock;
      }
  
  }
  