MSP430F551X_1 Datasheet, PDF (22/115 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F551x
MSP430F552x
SLAS590D – OCTOBER 2009 – REVISED APRIL 2010
JTAG Operation
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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 7. For further
details on interfacing to development tools and device programmers, see the MSP430 Hardware Tools User's
Guide, literature number SLAU278.
Table 7. JTAG Pin Requirements and Functions
DEVICE SIGNAL
PJ.3/TCK
PJ.2/TMS
PJ.1/TDI/TCLK
PJ.0/TDO
TEST/SBWTCK
RST/NMI/SBWTDIO
VCC
VSS
DIRECTION
IN
IN
IN
OUT
IN
IN
FUNCTION
JTAG clock input
JTAG state control
JTAG data input/TCLK input
JTAG data output
Enable JTAG pins
External reset
Power supply
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 8. For further details on interfacing to development tools and
device programmers, see the MSP430 Hardware Tools User's Guide, literature number SLAU278.
Table 8. Spy-Bi-Wire Pin Requirements and Functions
DEVICE SIGNAL
TEST/SBWTCK
RST/NMI/SBWTDIO
VCC
VSS
DIRECTION
IN
IN, OUT
FUNCTION
Spy-Bi-Wire clock input
Spy-Bi-Wire data input/output
Power supply
Ground supply
Flash Memory
The flash memory can be programmed via the JTAG port, Spy-Bi-Wire (SBW), the BSL, or in-system by the
CPU. The CPU can perform single-byte, single-word, and long-word writes to the flash memory. Features of the
flash memory include:
• Flash memory has n segments of main memory and four segments of information memory (A to D) of
128 bytes each. Each segment in main memory is 512 bytes in size.
• Segments 0 to n may be erased in one step, or each segment may be individually erased.
• Segments A to D can be erased individually. Segments A to D are also called information memory.
• Segment A can be locked separately.
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