SLAU664 User guide

SLAU664B February 2016 – August 2017

2.2.3 Emulator Connection: Isolation Jumper Block

The isolation jumper block at jumper J101 allows the user to connect or disconnect signals that cross from the eZ-FET domain into the MSP430FR2311 MCU target domain. This includes eZ-FET Spy-Bi-Wire signals, application UART signals, and 3.3-V and 5-V power.

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 the eZ-FET and target domains
To expose the target microcontroller pins for other use than onboard debugging and application UART communication
To expose the programming and UART interface of the eZ-FET so that it can be used for devices other than the onboard microcontroller

Table 2. Isolation Block Connections⁽¹⁾

Jumper	Description
GND	Ground
5V	5-V VBUS from USB
3V3	3.3-V rail, derived from VBUS in the eZ-FET domain
RXD <<	Backchannel UART: The target FR2311 receives data through this signal. The arrows indicate the direction of the signal.
TXD >>	Backchannel UART: The target FR2311 sends data through this signal. The arrows indicate the direction of the signal.
SBW RST	Spy-Bi-Wire emulation: SBWTDIO data signal. This pin also functions as the RST signal (active low).
SBW TST	Spy-Bi-Wire emulation: SBWTCK clock signal. This pin also functions as the TST signal.

(1) Also see Figure 6.

Figure 6. eZ-FET Isolation Jumper Block Diagram

2.2.3 Emulator Connection: Isolation Jumper Block

Table 2. Isolation Block Connections(1)

Table 2. Isolation Block Connections⁽¹⁾