Datasheet

MSP430F5438, MSP430F5437, MSP430F5436, MSP430F5435

MSP430F5419, MSP430F5418

SLAS612D –AUGUST 2009–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 a complete description of the features of the JTAG interface

and its implementation, see MSP430 Programming Via the JTAG Interface (SLAU320). For further details on

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

(SLAU278).

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 (Link to User's Guide)

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 (Link to User's Guide)

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.

Product Folder Links: MSP430F5438 MSP430F5437 MSP430F5436 MSP430F5435 MSP430F5419 MSP430F5418