Texas Instruments MSP-EXP430G2 사용자 설명서
Develop an Application With the MSP-EXP430G2 LaunchPad
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
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. 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.
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.
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.
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)
4.5
Connecting a Crystal Oscillator
The MSP-EXP430G2 LaunchPad offers a footprint for a variety of crystal oscillators. The XIN and XOUT
signals of the LFXT1 oscillator can support low-frequency oscillators like a watch crystals of 32768 Hz or a
standard crystal with a range defined in the associated data sheet. The signal lines XIN and XOUT can
also be used as multipurpose I/Os or as a digital frequency input. More information on the possibilities of
the low-frequency oscillator and the possible crystal selection can be found in the MSP430x2xx Family
User's Guide (
signals of the LFXT1 oscillator can support low-frequency oscillators like a watch crystals of 32768 Hz or a
standard crystal with a range defined in the associated data sheet. The signal lines XIN and XOUT can
also be used as multipurpose I/Os or as a digital frequency input. More information on the possibilities of
the low-frequency oscillator and the possible crystal selection can be found in the MSP430x2xx Family
User's Guide (
) or the device-specific data sheet.
The oscillator signals are connected to J2 to use the signals on an attached application board. In case of
signal distortion of the oscillator signals that leads to a fault indication at the basic clock module, resistors
R29 and R28 can be used to disconnect the pin header J2 from the oscillating lines.
signal distortion of the oscillator signals that leads to a fault indication at the basic clock module, resistors
R29 and R28 can be used to disconnect the pin header J2 from the oscillating lines.
11
SLAU318C – July 2010 – Revised August 2012
MSP-EXP430G2 LaunchPad Experimenter Board
Copyright © 2010–2012, Texas Instruments Incorporated