T W R - 9 S 1 2 G 1 2 8
J U N E 2 , 2 0 1 0
U S E R G U I D E
8
CAUTION:
When powered from the USB bus, do not exceed the 500mA maximum
allowable current drain. Damage to the target board or host PC may
result
OSBDM Bootloader
The OSBDM is pre-programmed with a bootloader application to allow field updates. The USB
bootloader communicates with a GUI application running on a host PC. The GUI application
allows the user to update OSBDM firmware easily and quickly. Option jumper JP401 enables
the bootloader at startup. This option header is not populated in default configuration. Refer
to Freescale Application Note
AN3561
for details on using the GUI application and bootloader.
The application note may be found at
www.freescale.com
or at
www.axman.com/support
.
BDM_PORT Header
A compatible HCS12 BDM cable can also be attached to the 6-pin BDM interface header at J3.
This header allows the use of external programming/debug cables. Refer to the external
programming/debug cable documentation for details on use. The figure below shows the pin-
out for the DEBUG header.
NOTE:
OSBDM is not functional at this time and will provide power to the board
only. Updated OSBDM firmware is expected in August 2010 to support the
HCS12 target. An external BDM is required to program and debug the
target MCU.
Figure 2: BDM_PORT Header
J400
BKGD
1
2
GND
See the associated RM for complete DEBUG
documentation
3
4
RESET*
5
6
VDD
NOTE:
This header is not installed in default configuration.
POWER
The TWR-S12 board may be powered from the OSBDM, from the Tower System, from the LIN
+V input, or 2 input vias at E1 & E2. The LIN +V input accepts +12V from the LIN bus and
uses an on-board regulator to create the board operating voltage. Input vias at E1 & E2 allow
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