Texas Instruments MSP430 manual 2. Target Connector Signal Functions

Programming Adapter Target Connector Signals

Table 3−2. Target Connector Signal Functions

Signal/Terminal Name	Required	Function/Comment
TMS	Mandatory	Test mode select functions according to IEEE1149.1
TCK	Mandatory	Test clock functions according to IEEE1149.1
TDI/VPP	Mandatory	Test data input functions according to IEEE1149.1, but
		with additional programming voltage for 3xx devices.
TDO/TDI	Mandatory	Test data output functions according to IEEE1149.1, but
		additional data input is used when programming voltage
		is applied by TDI/VPP.
GND	Mandatory	GND is the most-negative terminal.
VCC_MSP	Mandatory (if internal	Voltage source is used with MSP430 devices or PWBs.
	supply voltage is used)	The voltage level is set by software.
XOUT	Mandatory	Signal supplies the MSP430 system with clock signals.
	Optional	If not connected,
RST/NMI			RST/NMI must be held high.
Test/VPP	Mandatory	Signal used to select pin or JTAG function or to apply VPP
	(depending on device)

The output signal levels of the programming adapter are near GND or VCC_MSP.

-The RST/NMI terminal of the device must be high; otherwise, the access to the device via JTAG system may fail.

-The programming procedure (handling of the SW) is described in Chapters 1 and 2 of this manual.

-The connections from the MSP430 terminals must follow EMI rules, such as short lines and ground planes. If TMS line receives one negative pulse by EMI strike, the fuse current is activated (with fuse version 1.0). The fuse current flows from TDI(/VPP) pin to GND (or VSS).

Table 3−3. Programming Adapter Signal Levels

Signal/Pin	Signal/Pin Levels
TMS	VSS or VCC_MSP
TCK	VSS or VCC_MSP
TDI/VPP	VSS or VCC_MSP or VPP
TDO/TDI	VSS or VCC_MSP
XOUT	VSS or VCC_MSP
RST/NMI	VSS or VCC_MSP
Test/VPP	VSS or VCC_MSP or VPP

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