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MSP430FR2311: UART BSL

Part Number: MSP430FR2311

I want to use UART BSL to write a program to MSP430FR2311 but I couldn't.

I caught a picture of signals "RST#", "TEST", "UCA0RXD", "UCA0TXD"

After entry the BSL mode, first, TXD's voltage level fall down.

Why the MSP430 send the low level signal before CPU send passwords to MSP430?

When I set the CPU 9 Bytes Read Mode of UART, I could write the programs to MSP430.

But I set the 8 Bytes Read Mode, I couldn't success writing programs because MSP430 send the low level singal at first as mentioned above.

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