MSP430F663x
SLAS566C –JUNE 2010–REVISED AUGUST 2012
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Table 10. JTAG Pin Requirements and Functions
DEVICE SIGNAL
PJ.3/TCK
DIRECTION
FUNCTION
JTAG clock input
JTAG state control
JTAG data input, TCLK input
JTAG data output
Enable JTAG pins
External reset
IN
IN
PJ.2/TMS
PJ.1/TDI/TCLK
PJ.0/TDO
IN
OUT
IN
TEST/SBWTCK
RST/NMI/SBWTDIO
VCC
IN
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 11. For further details on interfacing to development tools and
device programmers, see the MSP430(tm) Hardware Tools User's Guide (SLAU278). For a complete description
of the features of the JTAG interface and its implementation, see MSP430 Programming Via the JTAG Interface
(SLAU320).
Table 11. Spy-Bi-Wire Pin Requirements and Functions
DEVICE SIGNAL
TEST/SBWTCK
RST/NMI/SBWTDIO
VCC
DIRECTION
IN
FUNCTION
Spy-Bi-Wire clock input
Spy-Bi-Wire data input/output
Power supply
IN, OUT
VSS
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, or as a group with segments 0 to n. Segments A to D are also
called information memory.
•
Segment A can be locked separately.
RAM Memory
The RAM memory is made up of n sectors. Each sector can be completely powered down to save leakage,
however all data is lost. Features of the RAM memory include:
•
•
•
•
RAM memory has n sectors. The size of a sector can be found in Memory Organization.
Each sector 0 to n can be complete disabled, however data retention is lost.
Each sector 0 to n automatically enters low power retention mode when possible.
For devices that contain USB memory, the USB memory can be used as normal RAM if USB is not required.
Backup RAM Memory
The backup RAM provides a limited number of bytes of RAM that are retained during LPMx.5 and during
operation from a backup supply if the Battery Backup System module is implemented.
There are 8 bytes of Backup RAM available on MSP430F663x. It can be wordwise accessed via the control
registers BAKMEM0, BAKMEM1, BAKMEM2, and BAKMEM3.
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