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msp430f149的TACCTLx寄存器中的CCISx选择问题

Other Parts Discussed in Thread: MSP430F149

msp430f149的TACCTLx寄存器中的CCISx如果写00,是将外部连接在CCIxA引脚上的输入作为捕获源,那如果CCISx选择写11,捕获源选择vcc,这是什么意思?怎么理解?