MSP430FR2433: Which IFGs will cause a reset?

Thomas Foxcroft said:

Will accessing vacant memory set the the VMAIFG? I think yes.

Yes. This includes accessing (e.g. reading) vacant (e.g. 0x3FFF contents) memory in nonexistent memory locations (e.g. 0x3100 address) and existing memory locations, even in the peripherals memory range (e.g. 0x077C). See code attached below.

Thomas Foxcroft said:

Is a peripheral area fetch going to set the VMAIFG? I do not know.

Possibly, but since a PUC is generated, VMAIFG probably doesn't matter at that point.

Thomas Foxcroft said:

Is accessing vacant memory and a peripheral area fetch the same thing? I think not, but I really don't know.

No. The big difference here is access versus fetch. Access or read is related to reading a value stored at a specific address, and fetch is related to executing whatever is stored at a specific address.

The user's guide summarizes this well on page 45:

Reads from vacant memory result in the value 3FFFh. In the case of a fetch, this is taken as JMP $. Fetch accesses from vacant
peripheral space result in a PUC.

Does this make more sense?

#include <msp430.h>

volatile unsigned int value;

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer

    P1OUT &= ~BIT0;                         // Clear P1.0 output latch for a defined power-on state
    P1DIR |= BIT0;                          // Set P1.0 to output direction

    PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode
                                            // to activate previously configured port settings

    // Activate vacant memory interrupt
    SFRIE1 = VMAIE;

    while(1)
    {
        // Read from vacant nonexistent memory between 0xC3FF - 0x3000
        // will cause  VMAIFG SNMI interrupt
        value = *((unsigned int*)0x3100);

        __delay_cycles(100000);             // Delay for 100000*(1/MCLK)=0.1s

        // Read from vacant peripheral memory between 0x0FFF - 0x0000
        // will not cause  VMAIFG SNMI interrupt
        value = *((unsigned int*)0x077C);

        __delay_cycles(100000);             // Delay for 100000*(1/MCLK)=0.1s

        // Read from nonvacant peripheral memory between 0x0FFF - 0x0000
        // will not cause  VMAIFG SNMI interrupt
        value = *((unsigned int*)0x04DA);

        __delay_cycles(100000);             // Delay for 100000*(1/MCLK)=0.1s
    }
}

// SYSNMI interrupt service routine
#pragma vector=SYSNMI_VECTOR
__interrupt void SYSNMI_ISR(void)
{
    if(VMAIFG)
    {
        P1OUT ^= BIT0;                      // Toggle P1.0 using exclusive-OR
        SFRIFG1 &= ~VMAIFG;                 // Clear VMAIFG
    }
}

msp430fr243x_vmaifg_detection.c.zip