Datasheet

1
3
5
7
9
11
13
2
4
6
8
10
12
14
TDO/TDI
TDI
TMS
TCK
GND
TEST
JTAG
VCC TOOL
VCC TARGET
J1 (see Note A)
J2 (see Note A)
V
CC
R1
47 kW
DVCC
RST/NMI/SBWTDIO
TDO/TDI
TDI
TMS
TCK
TEST/SBWTCK
DVSS
MSP430FRxxx
C1
1 nF
(see Note B)
RST
Important to connect
MSP430FR4133, MSP430FR4132, MSP430FR4131
www.ti.com SLAS865B –OCTOBER 2014–REVISED AUGUST 2015
7.1.3 JTAG
With the proper connections, the debugger and a hardware JTAG interface (such as the MSP-FET or
MSP-FET430UIF) can be used to program and debug code on the target board. In addition, the
connections also support the MSP-GANG production programmers, thus providing an easy way to
program prototype boards, if desired. Figure 7-3 shows the connections between the 14-pin JTAG
connector and the target device required to support in-system programming and debugging for 4-wire
JTAG communication. Figure 7-4 shows the connections for 2-wire JTAG mode (Spy-Bi-Wire).
The connections for the MSP-FET and MSP-FET430UIF interface modules and the MSP-GANG are
identical. Both can supply VCC to the target board (through pin 2). In addition, the MSP-FET and MSP-
FET430UIF interface modules and MSP-GANG have a VCC sense feature that, if used, requires an
alternate connection (pin 4 instead of pin 2). The VCC-sense feature senses the local VCC present on the
target board (that is, a battery or other local power supply) and adjusts the output signals accordingly.
Figure 7-3 and Figure 7-4 show a jumper block that supports both scenarios of supplying VCC to the
target board. If this flexibility is not required, the desired VCC connections may be hard-wired to eliminate
the jumper block. Pins 2 and 4 must not be connected at the same time.
For additional design information regarding the JTAG interface, see the MSP430 Hardware Tools User’s
Guide (SLAU278).
A. If a local target power supply is used, make connection J1. If power from the debug or programming adapter is used,
make connection J2.
B. The upper limit for C1 is 1.1 nF when using current TI tools.
Figure 7-3. Signal Connections for 4-Wire JTAG Communication
Copyright © 2014–2015, Texas Instruments Incorporated Applications, Implementation, and Layout 79
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Product Folder Links: MSP430FR4133 MSP430FR4132 MSP430FR4131