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Method 1: Deliberately leave an idle time of ten bits or more by delaying the time between the transmission of the last frame of data in the previous block and the transmission of the address frame of the new block.
2. Method 2: The SCI port first sets the TXWAKE bit (SCICTL1, bit 3) to 1 before writing to the SCITXBUF register. This sends an idle time of exactly 11 bits. In this method, the serial communications line is not idle any longer than necessary. (A don’t care byte has to be written to SCITXBUF after setting TXWAKE, and before sending the address, so as to transmit the idle time.)
说白了就是就是在上一block 和发送帧之前保持10个一号的空闲时间。
don't care data 的意思就是这个数据是无效的（可以写任意数据），不会被从发到数据线上去，因为已经置了TXWAKE位。
