msp430 sd16_A的sd16inchx 和外部的引脚是什么关系?
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在器件的UG中有相应描述:
The analog input of each channel is configured using the SD16INCTLx register. These settings can be independently configured for each SD16 channel. The SD16INCHx bits select one of eight differential input pairs of the analog multiplexer. The gain for each PGA is selected by the SD16GAINx bits. A total of six gain settings are available. During conversion any modification to the SD16INCHx and SD16GAINx bits will become effective with the next decimation step of the digital filter. After these bits are modified, the next three conversions may be invalid due to the settling time of the digital filter. This can be handled automatically with the SD16INTDLYx bits. When SD16INTDLY = 00h, conversion interrupt requests will not begin until the 4th conversion after a start condition. An external RC anti-aliasing filter is recommended for the SD16 to prevent aliasing of the input signal. The cutoff frequency should be < 10 kHz for a 1-MHz modulator clock and OSR = 256. The cutoff frequency may set to a lower frequency for applications that have lower bandwidth requirements.
以及
SD16INCHx Bits 2-0 SD16 channel differential pair input 000 Ax.0 001 Ax.1 010 Ax.2 011 Ax.3 100 Ax.4 101 Ax.5 110 Ax.6- Temperature Sensor 111 Ax.7- Short for PGA offset measurement