MSP430FR6889 Datasheet, PDF (149/176 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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MSP430FR6889, MSP430FR68891, MSP430FR6888, MSP430FR6887
MSP430FR5889, MSP430FR58891, MSP430FR5888, MSP430FR5887
SLASE32A – AUGUST 2014 – REVISED MARCH 2015
LFXIN
or
HFXIN
LFXOUT
or
HFXOUT
C
C
L1
L2
Figure 7-2. Typical Crystal Connection
See the application report MSP430 32-kHz Crystal Oscillators (SLAA322) for more information on
selecting, testing, and designing a crystal oscillator with the MSP430 devices.
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).
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Applications, Implementation, and Layout 149
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