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Hardware

Also unlike the eZ-FET on the G2 LaunchPad, this eZ-FET lite supports hardware flow control, if desired.

Hardware flow control (CTS and RTS handshaking) allows the target F5529 and the emulator to tell each

other to wait before sending more data. At slow baud rates and with simple target applications, flow

control may not be necessary. An application with faster baud rates and more interrupts to service has a

higher likelihood that it cannot read the USCI_A1's RXBUF register in time, before the next byte arrives. If

this happens, the USCI_A1's UCA1STAT register will report an overrun error.

To implement the backchannel on the target F5529, a simple library is provided within the

simpleUsbBackchannel example. It supports communication with and without hardware flow control. See

Section 3.6.4 for more information.

2.2.7 Emulator and Target Isolation Jumper Block

A set of ten jumpers is placed between the emulator and the F5529 target device. This is the isolation

jumper block (see Figure 16 and Table 3). Individual functions on the isolation block are described in the

following sections.

Figure 16. Isolation Jumper Block

Table 3. Isolation Block Connections

Jumper (from Description

left to right)

GND Ground

5V 5-V VBUS, sourced from the USB host. The F5529 target needs this if attempting a USB connection with it.

3V3 3.3-V rail, derived from VBUS with a dc-dc converter

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 it is ready to receive data. The arrows indicate the direction of the signal.

Backchannel UART: the target F5529 receives data through this signal. The arrows indicate the direction of the

RXD <<

signal.

Backchannel UART: the target F5529 sends data through this signal. The arrows indicate the direction of the

TXD >>

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.

N/C Not connected. Reserved.

SLAU533A–September 2013–Revised January 2014 MSP430F5529 LaunchPad™ Development Tool (MSP

‑

EXP430F5529LP)

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