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在配置UCAxCTL1,UCBxCTL1中
UCSSELx Bits 7-6 USCI clock source select. These bits select the BRCLK source clock in master mode. UCxCLK is always
used in slave mode.
00 NA
01 ACLK
10 SMCLK
11 SMCLK
10和11各代表什么？
10和11 都对应的是SMCLK，就是说无论是10和11，对应的UCA0时钟源都是SMCLK
