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SLAU595A–October 2014–Revised July 2015
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MSP430FR4133 LaunchPad™ Development Kit (MSP ‑ EXP430FR4133)
The backchannel UART is the "MSP Application UART1" port. In this case, Figure 7 shows COM13, but
this port can vary from one host PC to the next. After you identify the correct COM port, configure it in
your host application according to its documentation. You can then open the port and begin
communication to it from the host.
On the target MSP430FR4133 side, the backchannel is connected to the eUSCI_A0 module. The eZ-FET
has a configurable baud rate; therefore, it is important that the PC application configures the baud rate to
be the same as what is configured on the eUSCI_A0.
The eZ-FET also supports hardware flow control, if desired. Hardware flow control (CTS and RTS
handshaking) allows the target MSP430FR4133 and the emulator to tell each other to wait before sending
more data. At low baud rates and with simple target applications, flow control may not be necessary.
Applications with higher baud rates and more interrupts to service have a higher likelihood that the will not
be able to read the eUSCI_A0 RXBUF register in time, before the next byte arrives. If this happens, the
eUSCI_A0 UCA0STATW register reports an overrun error.
2.2.5 Special Features
2.2.5.1 Liquid Crystal Display (LCD)
The MSP430FR4133 LaunchPad features an on-board LCD (see Figure 8). This LCD is driven by the
internal LCD driver on the MSP430FR4133 device.
Figure 8. LCD Segment Layout