MSP430 Clock Settings (Part 4)-EEWORLD

Collect

3. CPU running on crystal (32768Hz) and DCO clock:

The slowest frequency we can run the DCO at is about 1MHz (which is also the default speed).
Therefore, we will start by switching the MCLK to the DCO. In most systems, you will want ACLK to run on the VLO or 32768 Hz crystal.
Since ACLK in our current code is running on the crystal, we will turn on the DCO calculation.

#include

void main(void)

{

    WDTCTL = WDTPW + WDTHOLD;
    turn off watchdog timer

    if (CALBC1_1MHZ == 0xFF || CALDCO_1MHZ == 0xFF)

    {

        while(1);
        suspend

    }

    BCSCTL1 = CALBC1_1MHZ;

    DCOCTL = CALDCO_1MHZ;
    set DCO mode

    P1DIR = 0x41;
    and P1.6 configure output

    P1OUT = 0x01;
    turn on

    BCSCTL3 |= LFXT1S_0;

    while(IFG1 & OFIFG)

    {

        IFG1 &= ~OFIFG;
        clear OSCFault flag

        _delay_cycles(100000);
        delay for visible flag

    }

    P1OUT = 0;
    turn off

    // __bis_SR_register(SCG1 + SCG0); turn off DCO

    BCSCTL2 |= SELM_0 + DIVM_3;

    while(1)

    {

        P1OUT = 0x40;
        turn

        on_delay_cycles(100);

        P1OUT = 0;
        turn

        off_delay_cycles(5000);

    }

}

Keywords：MSP430 Reference address：MSP430 Clock Settings (Part 4)

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