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请教MSP430 LaunchPad的demo温度测量中的时钟设定代码

void InitializeClocks(void)
{

BCSCTL1 = CALBC1_1MHZ; // Set range
DCOCTL = CALDCO_1MHZ;
BCSCTL2 &= ~(DIVS_3); // SMCLK = DCO / 8 = 1MHz
}

这是官方下载的源代码,请问

BCSCTL1 = CALBC1_1MHZ; // Set range
DCOCTL = CALDCO_1MHZ;

DCO的频率是多少?不是1MHz?