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4-Wire JTAG Connections

J1 vs. J2: JTAG matches or supplies target VCC RST is optional, TEST for 20/28-pin devices only See UG for recommended reset R/C

VCC

J1 J2

VCC

/ AVCC

/ DVCC

R1 47k

C2 10

C3 0.1

MSP430Fxxx

JTAG

1

TDO/TDI

3

TDI/VPP

5

TMS

7

TCK

9

GND

11

RST

VCC TOOL VCC TARGET

TEST/VPP

2 4 6 8 10 12 14

13

RST/NMI TDO/TDI TDI/VPP TMS TCK

C1 10nF/2.2nF

TEST/VPP VSS / AVSS / DVSS

25

Pin

Direction

Usage

TMS

IN

Signal to control the JTAG state machine

TCK

IN

JTAG clock input

TDI

IN

JTAG data input/TCLK input

TDO

OUT

JTAG data output

TEST

IN

Enable JTAG pins (shared JTAG devices only)

4-Wire JTAG Details

  • Larger MSP430 devices: dedicated JTAG pins

  • Smaller MSP430 devices: shared JTAG/GPIO pins

  • The mode of the shared pins is determined by an additional TEST pin

  • TEST is pulled low internally, enabling GPIO mode

26

13

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