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

 

 

3-4

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Texas Instruments MSP430 manual 2. Target Connector Signal Functions