msp430的时钟设定API程序，包括XT2的开关，DCO的设定和MCLK及SMCLK的时钟源选择，从此不用记寄存器

void XT2_on()

void XT2_off()

void DCOset(BYTE freq) //1,2,4,8,10,12,14,15,16,20,32

void Msource(char source) //enum:ACLK,XT2,DCO

void SMsource(char source) //enum:XT2,DCO-msp430‘s clock settings API procedures, including the XT2 switch, DCO and SMCLK set and MCLK clock source selection, from not remember register void XT2_on ()　void XT2_off ()　void DCOset (BYTE freq) // 1 , 2,4,8,10,12,14,15,16,20,32 void Msource (char source) // enum: ACLK, XT2, DCO void SMsource (char source) // enum: XT2, DCO