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User’s Guide
SWRU321A
– May 2013
Page 14/32
In addition to regular debugging capabilities using cJTAG or JTAG, the XDS100v3 Emulator
supports a UART backchannel over a USB Virtual COM Port (VCP) to the PC. The UART back
channel supports flow control, 8-N-1 format and data rates up to 12Mbaud.
Please see the XDS100v3 emulator product page [4] for detailed information about the emulator.
The XDS100v3 Emulator is powered over USB and is switched on as long as the USB cable is
connected to the SmartRF06EB and the main power switch (S501) is in the ON position. The
XDS100v3 Emulator supports targets with operating voltages between 1.8 V and 3.6. The min
(max) operating temperature is -20 (+70)
˚C.
6.1.1 UART back channel
The mounted EM can be connected to the PC via the XDS100v3 Emulator’s UART back channel.
When connected to a PC, the XDS100v3 is enumerated as a Virtual COM Port (VCP) over USB.
The driver used is a royalty free VCP driver from FTDI, available for e.g. Microsoft Windows,
Linux and Max OS X. The UART back channel gives the mounted EM access to a four pin UART
interface, supporting 8-N-1 format at data rates up to 12 Mbaud.
To enable the SmartRF06EB UART back channel
the “Enable UART over XDS100v3” jumper
(J5), located on the lower right side of the EB, must be mounted (Figure 7). Table 4 shows an
overview of the I/O signals related to UART Back Channel.
Figure 7
– Jumper mounted on J5 to enable the UART back channel
Signal name
Description
Probe header
EM pin
RF1.7_UART_RX
UART Receive (EM data in)
EM_UART_RX (P412.2)
RF1.7
RF1.9_UART_TX
UART Transmit (EM data out)
EM_UART_TX (P412.3)
RF1.9
RF1.3_UART_CTS
UART Clear To Send signal
EM_UART_CTS (P412.4)
RF1.3
RF2.18_UART_RTS UART Request To Send signal
EM_UART_RTS (P412.5)
RF2.18
Table 4
– UART Back channel signal connections
6.2 Power Sources
There are three ways to power the SmartRF06EB; batteries, USB bus and external power supply.
The power source can be selected using the power source selection switch (S502) seen in Figure
8. The XDS100v3 Emulator can only be powered over USB. The main power supply switch
(S501) cuts power to the SmartRF06EB.
Never connect batteries and an external power source to the SmartRF06EB at the
same time! Doing so may lead to excessive currents that may damage the batteries
or cause onboard components to break. The CR2032 coin cell battery is in particular
very sensitive to reverse currents (charging) and must never be combined with other
power sources (AAA batteries or an external power source).
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