Texas Instruments Serial Programming Adapter MSP430 - Manual (Page 40)

Programming Adapter Target Connector Signals
3-4
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
supply voltage is used) Voltage source is used with MSP430 devices or PWBs.
The voltage level is set by software.
XOUT Mandatory Signal supplies the MSP430 system with clock signals.
RST/NMI Optional If not connected, RST/NMI must be held high.
Test/VPP Mandatory
(depending on device) Signal used to select pin or JTAG function or to apply VPP
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