Hardware
9
SLAU678A – March 2016 – Revised April 2016
Copyright © 2016, Texas Instruments Incorporated
MSP430FR5994 LaunchPad™ Development Kit (MSP
‑
EXP430FR5994)
2.2.3
Debug Probe Connection: Isolation Jumper Block
The isolation jumper block at jumper J101 can connect or disconnect signals that cross from the eZ-FET
domain into the MSP430FR5994 target domain. This includes eZ-FET Spy-Bi-Wire signals, application
UART signals, and 3.3-V and 5-V power (see
and
Reasons to open these connections:
•
To remove any and all influence from the eZ-FET debug probe for high accuracy target power
measurements
•
To control 3-V and 5-V power flow between the eZ-FET and target domains
•
To expose the target MCU pins for other use than onboard debugging and application UART
communication
•
To expose the programming and UART interface of the eZ-FET so that it can be used for devices other
than the onboard MCU.
Table 2. Isolation Block Connections
Jumper
Description
GND
Ground
5V
5-V VBUS from USB
3V3
3.3-V rail, derived from VBUS in the eZ-FET domain
RXD <<
Backchannel UART: The target FR5994 receives data through this signal. The arrows indicate the direction of the
signal.
TXD >>
Backchannel UART: The target FR5994 sends data through this signal. The arrows indicate the direction of the
signal.
SBW RST
Spy-Bi-Wire debug: SBWTDIO data signal. This pin also functions as the RST signal (active low).
SBW TST
Spy-Bi-Wire debug: SBWTCK clock signal. This pin also functions as the TST signal.
