MSP430F6438, MSP430F6436, MSP430F6435, MSP430F6433
SLAS720D – AUGUST 2010 – REVISED DECEMBER 2015
6.7
Bootloader (BSL)
The BSL enables users to program the flash memory or RAM using a UART serial interfaces. Access to
the device memory by the BSL is protected by an user-defined password. Use of the BSL requires
external access to six pins (see
). 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 With the Bootloader (BSL)
).
Table 6-5. UART BSL Pin Requirements and Functions
DEVICE SIGNAL
BSL FUNCTION
RST/NMI/SBWTDIO
Entry sequence signal
TEST/SBWTCK
Entry sequence signal
P1.1
Data transmit
P1.2
Data receive
VCC
Power supply
VSS
Ground supply
6.8
JTAG Operation
6.8.1
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.
lists the JTAG pin requirements. For
further details on interfacing to development tools and device programmers, see the
MSP430™ Hardware
Tools User's Guide
(
). For a complete description of the features of the JTAG interface and its
implementation, see
MSP430 Programming Via the JTAG Interface
(
Table 6-6. JTAG Pin Requirements and Functions
DEVICE SIGNAL
DIRECTION
FUNCTION
PJ.3/TCK
IN
JTAG clock input
PJ.2/TMS
IN
JTAG state control
PJ.1/TDI/TCLK
IN
JTAG data input, TCLK input
PJ.0/TDO
OUT
JTAG data output
TEST/SBWTCK
IN
Enable JTAG pins
RST/NMI/SBWTDIO
IN
External reset
VCC
Power supply
VSS
Ground supply
6.8.2
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.
lists the Spy-Bi-Wire interface pin requirements. For further details on interfacing to
development tools and device programmers, see the
MSP430 Hardware Tools User's Guide
).
For a complete description of the features of the JTAG interface and its implementation, see
MSP430
Programming Via the JTAG Interface
(
60
Detailed Description
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