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Timer configurations for 100ms delay in MSP430G2533

Akila CM
Prodigy 180 points

Hi,

I was using external osc so timer was proper for 100ms and 1 sec delays.

now i changed to internal osc smclk  . Timer looks not proper (slow) . how to calculate values for timer (smclk) ?

Thanks,

Akila.

  • 0
    Guru 74080 points

    Akila,

    how did you initialize your DCO? When you do not set it to anything specific, it runs with roughly 1MHz, but the processor has four calibrated frequency settings in the info A memory. These are 1MHz, 8MHz, 12MHz and 16MHz. You set them by writing

    BCSCTL1 = CALBC1_1MHZ; // CALBC1_8MHZ or CALBC1_12MHZ or CALBC1_16MHZ
DCOCTL  = CALDCO_1MHZ; // CALDCO_8MHZ or CALDCO_12MHZ or CALDCO_16MHZ

    You can check the frequency by outputting it to pin 1.4 (SMCLK) when selecting the special function by writing

    P1SEL |= 0x10;
P1DIR |= 0x10;

    When set to one of these known frequencies, you can easily calculate your 100ms timer value.

    Dennis

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