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 * Copyright (c) 2012, Texas Instruments Incorporated
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 *    notice, this list of conditions and the following disclaimer.
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 *******************************************************************************
 * 
 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 code examples are self-contained low-level programs that typically
 * demonstrate a single peripheral function or device feature in a highly
 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//   MSP430F20xx Demo - Reset on Invalid Address fetch, Toggle P1.0
//
//  Description: Toggle P1.0 by xor'ing P1.0 inside of a software loop that
//  ends with TAR loaded with 3FFFh - op-code for "jmp $" This simulates a code
//  error. The MSP430F21x1 will force a reset because it will not allow a fetch
//  from within the address range of the peripheral memory, as is seen by
//  return to the mainloop and LED flash.
//  In contrast, an MSP430F1xx device will "jmp $" stopping code execution with
//  no LED flash.
//  ACLK = n/a, MCLK = SMCLK = default DCO
//
//                MSP430F20xx
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |             P1.0|-->LED
//
//  H. Grewal / M. Buccini
//  Texas Instruments Inc.
//  October 2005
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.40A
//******************************************************************************

#include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
  P1DIR |= 0x01;                            // Set P1.0 to output direction
  TAR = 0x3FFF;                             // Opcode for "jmp $"

  for (;;)
  {
    volatile unsigned int i;

    P1OUT ^= 0x01;                          // Toggle P1.0 using exclusive-OR

    i = 50000;                              // Delay
    do (i--);
    while (i != 0);
    ((void (*)())0x170)();                  // Invalid fetch ("call #0170h")
  }
}