Develop an Application With the MSP-EXP430G2 LaunchPad
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emulator TXD signal to target P1.1 and the emulator RXD to target P1.2, as required for the USCI module.
Keep in mind that UART communication is full duplex, so connections are made for both transmit and
receive on each side, and the labeling is specific to what action each side of the UART bus is performing.
For example, the emulator TXD (transmit) signal connects to the target RXD (receive) signal, and the
emulator RXD signal connects to the target TXD signal.
4.4
Program Connected eZ430 Target Boards
The MSP-EXP430G2 LaunchPad can program the eZ430-RF2500T target boards, the eZ430-Chronos
watch module, or the eZ430-F2012T/F2013T. To connect one of the ez430 targets, connector J4 must be
populated with a 0.050-in (1.27-mm) pitch male header, as shown in
Figure 4
.
Figure 4. MSP-EXP430G2 LaunchPad With Attached eZ430-RF2500 Target Board
To program the attached target without interfering with the LaunchPad socket board, jumper connections
TEST and RST of J3 must be open. The interface to the eZ430 target board is always connected to the
MSP-EXP430G2 emulator, so the programming and debugging of a connected LaunchPad target device
is possible only if the eZ430 target is not connected on the same time. The application UART, on the other
hand, is connected directly to the LaunchPad target device, and jumper J3 can be closed to monitor the
transmission from the LaunchPad target to the attached eZ430. This way both possible connections, from
the device to the PC and from the device to the eZ430, can be established without changing the direction
of the UART pins.
The VCC connection to the eZ430 interface is directly connected to the LaunchPad target VCC and can
be separated with jumper J3, if the LaunchPad itself should be powered via a connected battery on J4. To
supply the eZ430 interface with the onboard emulator the jumper J3 VCC needs to be closed.
Table 2
shows the pinout of the eZ430 debugging interface J4, the first pin is the left pin located on the
emulator part of the LaunchPad.
Table 2. eZ430 Debugging Interface
Pin
Signal
Description
1
TXD
UART transmit data output (UART communication from PC or MSP430G2xx to eZ430 target board)
2
VCC
Power supply voltage (J3 VCC needs to be closed to supply via onboard emulator)
3
TEST / SBWTCK
Test mode for JTAG pins and Spy-Bi-Wire test clock input during programming and test
4
RST / SBWTDIO
Reset, Spy-Bi-Wire test data input/output during programming and test
5
GND
Power supply ground
6
RXD
UART receive data input (UART communication from eZ430 target board to PC or MSP430G2xx)
10
MSP-EXP430G2 LaunchPad Evaluation Kit
SLAU318F – July 2010 – Revised January 2015
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