User manual

XDS110-ET

Emulator MCU

Isolation

Block

JTAG and SWD

Application UART

3.3V Power

5V Power

MSP432P401R

Target MCU

XDS110-ETMSP432 Target

USB Connector

in out

LDO

BoosterPack Header

USB

EnergyTrace

S101

eUSCI_A0

Hardware

www.ti.com

Table 1. Isolation Block Connections (continued)

Signal Isolation Type

(1)(2)

Description

TMS_SWDIO Switch S101 Serial wire data input/output (SWDIO) / JTAG test mode select (TMS)

TDO_SWO Switch S101 Serial wire trace output (SWO) / JTAG trace output (TWO) (Also PJ.5)

TDI Switch* S101 JTAG test data input (Also PJ.4)

Reasons to open these connections:

• To remove any and all influence from the XDS110-ET emulator for high accuracy target power

measurements

• To control 3-V and 5-V power flow between the XDS110-ET and target domains

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

communication

• To expose the UART interface of the XDS110-ET so that it can be used for devices other than the

onboard MCU.

Figure 6. XDS110-ET Isolation Block

2.3.2 Application (or “Backchannel”) UART

The XDS110-ET provides a “backchannel” UART-over-USB connection with the host, which can be very

useful during debugging and for easy communication with a PC. The provided UART supports hardware

flow control (RTS and CTS); although by default these signals are not connected to the target.

MSP

‑

EXP432P401R LaunchPad™ Evaluation Kit SLAU597–March 2015

Submit Documentation Feedback