data sheet上面有16组测试结果：
TEST CONDITIONS | MIN | TYP | MAX UNIT
DCORSELx = 0, DCOx = 0, MODx = 0 | 0.07 | | 0.20 MHz
DCORSELx = 0, DCOx = 31, MODx = 0 | 0.70 | | 1.70 MHz
| | |
DCORSELx = 5, DCOx = 0, MODx = 0 | 2.5 | | 6.0 MHz
DCORSELx = 5, DCOx = 31, MODx = 0 | 23.7 | | 54.1 MHz
这是DCOx=0的时候的情况，DCOx=0时 DCO的频率范围是多少呢？
下面是TI的例子程序，msp430x54x_UCS_2
__bis_SR_register(SCG0); // Disable the FLL control loop
UCSCTL0 = 0x0000; // Set lowest possible DCOx, MODx
UCSCTL1 = DCORSEL_5; // Select DCO range 16MHz operation
UCSCTL2 = FLLD_1 + 249; // Set DCO Multiplier for 8MHz
// (N + 1) * FLLRef = Fdco
// (249 + 1) * 32768 = 8MHz
// Set FLL Div = fDCOCLK/2
__bic_SR_register(SCG0); // Enable the FLL control loop
设置的DCORSEL_5 datasheet上5的范围是:2.5-6MHZ 23.7-54.1MHZ
例子的注释是说:select DCO range 16MHZ.但是16M不在上面的范围里啊。
肯定是我哪里理解出错了，请大侠指教，这个范围怎么选。 | 
