//****************************************************************************** // MSP430G2xx1 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 // // MSP430G2xx1 // // /|\| XIN|// | | | // |RST XOUT|// | | // | P1.0| >LED // // H Grewal / M Buccini // Texas Instruments Inc // October 2010 // Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10 //****************************************************************************** #include void main(void) { WDTCTL = WDTPW + WDTHOLD; P1DIR |= 0x01; TAR = 0x3FFF; // Stop watchdog timer // Set P1.0 to output direction // Opcode for "jmp $" for (;;) { volatile unsigned int i; } } P1OUT ^= 0x01; // Toggle P1.0 using exclusive-OR i = 50000; (i ); while (i != 0); ((void (*)())0x170)(); // Delay // Invalid fetch ("call #0170h")