msp430g2xx2 wdt 05

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.. //

//****************************************************************************** // MSP430G2xx2 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

//

// MSP430G2xx2

//

-// /|\|

XIN|-// | | |

// |RST

XOUT|-// | |

// | P1.0| >LED

//

// H Grewal / M Buccini

// Texas Instruments Inc

// December 2010

// Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10

//******************************************************************************

#include <msp430g2452.h>

void 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") }

}