Hardware
12
SLAU802 – March 2019
Copyright © 2019, Texas Instruments Incorporated
MSP430FR2476 LaunchPad™ Development Kit (LP
‑
MSP430FR2476)
2.5
Clocking
The LP-MSP430FR2476 provides an external clock in addition to the internal clocks in the device.
•
Q1: 32.768-kHz 12.5-pF crystal
The 32.768-kHz crystal allows for lower LPM sleep currents than do the other low-frequency clock
sources. Therefore, the presence of the crystal allows the full range of low-power modes to be used.
The internal clocks in the device default to the following configuration:
•
MCLK: DCO at 1 MHz
•
SMCLK: DCO at 1 MHz
•
ACLK: REFO at 32.768 kHz
For more information about configuring internal clocks and using the external oscillators, see the
MSP430FR4xx and MSP430FR2xx Family User's Guide
.
2.6
Using the eZ-FET Debug Probe With a Different Target
The eZ-FET debug probe on the LaunchPad development kit can interface to most MSP430 MCUs, not
just the onboard MSP430FR2476 target device.
To interface to another MCU, disconnect all jumpers in the isolation jumper block. This is necessary
because the debug probe cannot connect to more than one target at a time over the Spy-Bi-Wire (SBW)
connection.
Next, make sure the target board has proper connections for SBW. To be compatible with SBW, the
capacitor on RST/SBWTDIO must be 2.2 nF or less. For documentation on designing MSP430 JTAG
interface circuitry, see the
MSP430 Hardware Tools User's Guide
.
Finally, wire together the following signals from the debug probe side of the isolation jumper block to the
target hardware:
•
5 V (if 5 V is needed)
•
3.3 V
•
GND
•
SBWTDIO
•
SBWTCK
•
TXD (if the UART backchannel is to be used)
•
RXD (if the UART backchannel is to be used)
This wiring can be done either with jumper wires or by designing the board with a connector that plugs into
the isolation jumper block.
2.7
BoosterPack Plug-in Module Pinout
The LaunchPad development kit adheres to the 40-pin LaunchPad development kit pinout standard. This
standard was created to aid compatibility between LaunchPad development kits and BoosterPack plug-in
modules across the TI ecosystem.
While most BoosterPack plug-in modules are compliant with the standard, some are not. The LP-
MSP430FR2476 LaunchPad development kit is compatible with all 40-pin BoosterPack plug-in modules
that are compliant with the standard. If the reseller or owner of the BoosterPack plug-in module does not
explicitly indicate compatibility with the LP-MSP430FR2476 LaunchPad development kit, compare the
schematic of the candidate BoosterPack plug-in module with the LaunchPad development kit to ensure
compatibility. Keep in mind that sometimes conflicts can be resolved by changing the MSP430FR2476
device pin function configuration in software.
