Hardware
9
SLAU595B – October 2014 – Revised January 2017
Copyright © 2014–2017, Texas Instruments Incorporated
MSP430FR4133 LaunchPad™ Development Kit (MSP
‑
EXP430FR4133)
2.2.3
Emulator Connection: Isolation Jumper Block
The isolation jumper block at jumper J101 allows the user to connect or disconnect signals that cross from
the eZ-FET domain into the MSP430FR4133 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 emulator 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 by an LDO in the eZ-FET domain
RTS >>
Backchannel UART: Ready-To-Send, for hardware flow control. The target can use this to indicate whether it
is ready to receive data from the host PC. The arrows indicate the direction of the signal.
CTS <<
Backchannel UART: Clear-To-Send, for hardware flow control. The host PC (through the emulator) uses this
to indicate whether it is ready to receive data. The arrows indicate the direction of the signal.
RXD <<
Backchannel UART: The target FR4133 receives data through this signal. The arrows indicate the direction
of the signal.
TXD >>
Backchannel UART: The target FR4133 sends data through this signal. The arrows indicate the direction of
the signal.
SBW RST
Spy-Bi-Wire emulation: SBWTDIO data signal. This pin also functions as the RST signal (active low).
SBW TST
Spy-Bi-Wire emulation: SBWTCK clock signal. This pin also functions as the TST signal.
