eZ-FET Debug
Probe
Isolation
Jumper Block
Sp
y
-Bi
-W
ire
(
SBW
)
Emu
la
ti
o
n
Ap
p
lica
ti
o
n
U
AR
T
3
.3
-V
Po
w
e
r
5
-V
Po
w
e
r
Target MSP430 MCU
e
Z
-F
ET
MSP
4
3
0
T
a
rg
e
t
USB Connector
in out
LDO
Bo
o
st
e
rPa
ck
H
e
a
d
e
r
Bo
o
st
e
rPa
ck
H
e
a
d
e
r
USB
EnergyTrace
Hardware
10
SLAU678A – March 2016 – Revised April 2016
Copyright © 2016, Texas Instruments Incorporated
MSP430FR5994 LaunchPad™ Development Kit (MSP
‑
EXP430FR5994)
Figure 6. eZ-FET Isolation Jumper Block Diagram
2.2.4
Application (or Backchannel) UART
The backchannel UART allows communication with the USB host that is not part of the target application's
main functionality. This is very useful during development, and also provides a communication channel to
the PC host side. This can be used to create graphical user interfaces (GUIs) and other programs on the
PC that communicate with the LaunchPad development kit.
shows the pathway of the backchannel UART. The backchannel UART is the UART on
eUSCI_A0. This UART channel is separate from the UART on the 40-pin BoosterPack plug-in module
connector (eUSCI_A3).
On the host side, a virtual COM port for the application backchannel UART is generated when the
LaunchPad development kit enumerates on the host. You can use any PC application that interfaces with
COM ports, including terminal applications like Hyperterminal or Docklight, to open this port and
communicate with the target application. You need to identify the COM port for the backchannel. On
Windows PCs, Device Manager can assist (see
Figure 7. Application Backchannel UART in Device Manager
