Datasheet

MSP430BT5190

SLAS703A –APRIL 2010–REVISED AUGUST 2013

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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 6. 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 6. 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

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.

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.

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