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eZ-FET

Emulator

MCU

Isolation

Jumper Block

Spy-Bi-Wire (SBW)

Emulation

Application UART

3.3V Power

5V Power

Target

MSP430FR5969

MCU

eZ-FETMSP430FR5969 Target

USB Connector

in out

LDO

BoosterPack Header

USCI A0

USB

Hardware

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2.3.4 Emulator Connection – Isolation Jumper Block

The isolation jumper block at Jumper J13 allows the user to connect/disconnect signals that cross from

the eZ-FET domain into the FR5969 target domain. This includes eZ-FET Spy-Bi-Wire signals, application

UART signals, and 3V3 and 5V power (see Table 3).

Reasons to open these connections:

• To remove any and all influence from the eZ-FET emulator for high accuracy target power

measurements

• To control 3-V and 5-V power flow between eZ-FET and target domains

• To expose the target MCU pins for other use than onboard debugging and application UART

communication

• To expose programming and UART interface of the eZ-FET so it can be used for devices other than

the onboard MCU.

Table 3. Isolation Block Connections

Jumper Description

GND Ground

V+ 3.3-V rail, derived from VBUS by an LDO in the eZ-FET domain

Backchannel UART: Ready-To-Send, for hardware flow control. The target can use this to indicate whether 'it is

RTS >>

ready to receive data from the host PC. The arrows indicate the direction of the signal.

Backchannel UART: Clear-To-Send, for hardware flow control. The host PC (through the emulator) uses this to

CTS <<

indicate whether or not it is ready to receive data. The arrows indicate the direction of the signal.

Backchannel UART: the target FR5969 receives data through this signal. The arrows indicate the direction of the

RXD <<

signal.

Backchannel UART: the target FR5969 sends data through this signal. The arrows indicate the direction of the

TXD >>

signal.

RST Spy-Bi-Wire emulation: SBWTDIO data signal. This pin also functions as the RST signal (active low)

TST Spy-Bi-Wire emulation: SBWTCK clock signal. This pin also functions as the TST signal

Figure 10. eZ-FET Isolation Jumper Block Diagram

MSP-EXP430FR5969 LaunchPad™ Development Kit User's Guide SLAU535A–February 2014–Revised June 2014

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