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MSPM0L1306: OPA输入通道PSEL为什么不能选择VREF?

Part Number: MSPM0L1306
Other Parts Discussed in Thread: SYSCONFIG

1、通过用户手册可知OPA模块的PSEL是可以选择VREF的。但为什么SysConfig中将其设置为VREF会提示错误,如下图。

2、OPA模块中的RBOT、RTOP、RTAP分别是什么意思?

期待回复。