MSP430FR2433: LPM3 consumes around 17uA

#include <msp430.h> 


/**
 * main.c
 */
int main(void)
{
	WDTCTL = WDTPW | WDTHOLD;	// stop watchdog timer
	
    // Port Configuration all un-used pins to output low
    P1OUT = 0x00;
    P2OUT = 0x00;
    P3OUT = 0x00;
    P1DIR = 0xff;
    P2DIR = 0xff;
    P3DIR = 0xff;
    P1REN = 0xFF; P2REN = 0xFF; P3REN = 0xFF;

    CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK;  // MCLK=SMCLK=DCO; ACLK=REFO


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

    __bis_SR_register(LPM3_bits);     // Enter LPM3
    __no_operation();                       // For debug

	return 0;
}