一般都是支持串口接受空闲中断的吧，你可以看下，这个就是i2系列的空闲传输系统图以及完整的操作介绍
The UCDORM bit is used to control data reception in the idle-line multiprocessor format. When
UCDORM = 1, all non-address characters are assembled but not transferred into the UCAxRXBUF, and
interrupts are not generated. When an address character is received, the character is transferred into
UCAxRXBUF, UCRXIFG is set, and any applicable error flag is set when UCRXEIE = 1. When
UCRXEIE = 0 and an address character is received but has a framing error or parity error, the character is
not transferred into UCAxRXBUF and UCRXIFG is not set.
If an address is received, user software can validate the address and must reset UCDORM to continue
receiving data. If UCDORM remains set, only address characters are received. When UCDORM is cleared
during the reception of a character, the receive interrupt flag is set after the reception completed. The
UCDORM bit is not modified automatically by the eUSCI_A hardware.
For address transmission in idle-line multiprocessor format, a precise idle period can be generated by the
eUSCI_A to generate address character identifiers on UCAxTXD. The double-buffered UCTXADDR flag
indicates if the next character loaded into UCAxTXBUF is preceded by an idle line of 11 bits. UCTXADDR
is automatically cleared when the start bit is generated.
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