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芯片MSP430F67791, SD24_B问题

芯片MSP430F67791, SD24_B问题

 

我有点搞不懂了,请帮忙分析下是怎么回事

 

1.

SD24BCTL0 = SD24REFS | SD24SSEL_1;        // Select internal REF

                                              // Select SMCLK as SD24_B clock source

       SD24BOSR4 =OSR10;

       SD24BCCTL4 |=   SD24ALGN | SD24SNGL;                   // Single conversion

       SD24BIE = SD24IE4;

       SD24BCCTL4 |= SD24SC;

 

使用内部参考基准 OSR=1024有效分辨率(频率16M)

精度为2^30

为什么手册上写ADC值从800000-FFFFFF只有12BIT

而不是从000000-FFFFFF?

2.

假使我要将取样率设为256HZ

OSR=128

ADC精度就只有2^21 达不到24bit吗