Datasheet

MSP430F673x

MSP430F672x

SLAS731C –DECEMBER 2011–REVISED FEBRUARY 2013

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Bootstrap Loader (BSL)

The BSL enables users to program the flash memory or RAM using various serial interfaces. Access to the

device memory via the BSL is protected by an user-defined password. BSL entry requires a specific entry

sequence on the RST/NMI/SBWTDIO and TEST/SBWTCK pins. For complete description of the features of the

BSL and its implementation, see MSP430 Programming via the Bootstrap Loader (BSL) (SLAU319).

Table 11. UART BSL Pin Requirements and Functions

DEVICE SIGNAL BSL FUNCTION

RST/NMI/SBWTDIO Entry sequence signal

TEST/SBWTCK Entry sequence signal

P3.0 Data transmit

P3.1 Data receive

VCC Power supply

VSS Ground supply

JTAG Operation

JTAG Standard Interface

The MSP430 family supports the standard JTAG interface which requires four signals for sending and receiving

data. The JTAG signals are shared with general-purpose I/O. The TEST/SBWTCK pin is used to enable the

JTAG signals. In addition to these signals, the RST/NMI/SBWTDIO is required to interface with MSP430

development tools and device programmers. The JTAG pin requirements are shown in Table 12. For further

details on interfacing to development tools and device programmers, see the MSP430 Hardware Tools User's

Guide (SLAU278) and MSP430 Programming Via the JTAG Interface (SLAU320).

Table 12. JTAG Pin Requirements and Functions

DEVICE SIGNAL DIRECTION FUNCTION

PJ.3/ACLK/TCK IN JTAG clock input

PJ.2/ADC10CLK/TMS IN JTAG state control

PJ.1/MCLK/TDI/TCLK IN JTAG data input/TCLK input

PJ.0/SMCLK/TDO OUT JTAG data output

TEST/SBWTCK IN Enable JTAG pins

RST/NMI/SBWTDIO IN External reset

VCC Power supply

VSS Ground supply

Spy-Bi-Wire Interface

In addition to the standard JTAG interface, the MSP430 family supports the two-wire Spy-Bi-Wire interface. Spy-

Bi-Wire can be used to interface with MSP430 development tools and device programmers. The Spy-Bi-Wire

interface pin requirements are shown in Table 13. For further details on interfacing to development tools and

device programmers, see the MSP430 Hardware Tools User's Guide (SLAU278) and MSP430 Programming Via

the JTAG Interface (SLAU320).

Table 13. Spy-Bi-Wire Pin Requirements and Functions

DEVICE SIGNAL DIRECTION FUNCTION

TEST/SBWTCK IN Spy-Bi-Wire clock input

RST/NMI/SBWTDIO IN, OUT Spy-Bi-Wire data input/output

VCC Power supply

VSS Ground supply