Texas Instruments LAUNCHXL-F28069M, User Manual, Page: 7 / 25

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Hardware Configuration
7 SPRUI11B – January 2015 – Revised March 2019
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LAUNCHXL-F28069M Overview
The boot modes shown in Table 2 can be selected using S1:
Table 2. S1 Boot Mode Settings
Boot Mode
S1-Switch 1 (GPIO34)
H = Pulled to 1
L = Pulled to 0
S1-Switch 2 (GPIO37 / TDO)
H = Pulled to 1
L = Pulled to 0
S1-Switch 3 (TRSTn)
H = XDS100v2
(1)
L = Tied to 0
Emulation Boot
(2)
L H H
Parallel IO L L L
SCI H L L
Wait L H L
GetMode H H L
(1) TRSTn is controlled by the XDS100v2 when Switch 3 is set to the H position. While connected to the device, TRSTn is driven to
1 by the XDS100v2. While disconnected from the device, TRSTn is pulled to 0.
(2) When the board is first powered on through the XDS100v2 USB port, the device will boot before the user can connect to the
device. Therefore, Switch 1 and Switch 2 should be configured to the Wait boot mode to hold the CPU in a safe state until the
user can connect to the device.
NOTE: The USB debugger cannot connect to the device when S1-Switch 3 is placed in the L
position because TSRTn is disconnected from the XDS100v2.
More information about boot mode selection can be found in the Boot ROM section of the TMS320x2806x
Piccolo technical reference guide .
5.4 Connecting a Crystal
Although the Piccolo device present on the LAUNCHXL-F28069M has an internal oscillator — and for
most applications this is sufficient — the LaunchPad offers a footprint for through-hole HC-49 crystals for
users who require a more precise clock. If you wish to use an external crystal, solder the crystal to the Q1
footprint and appropriate load capacitors to the C3 and C4 footprints. You also need to configure the
device to use the external oscillator in software.
5.5 Connecting a BoosterPack
The F28069M LaunchPad is the perfect experimenter board to start hardware development with the
F2806x devices. All of the connectors are aligned in a 0.1-in (2.54-mm) grid to allow easy and inexpensive
development of add on boards called BoosterPacks. These satellite boards can access all of the GPIO
and analog signals. The the pin out of the connectors can be found in
Section 5 .