D E M O 9 S 0 8 S F 4
J U N E 9 , 2 0 0 9
U S E R G U I D E
7
DEVELOPMENT SUPPORT
Application development and debug for the target MC9S08SF4 is supported through the
integrated, Open-Source Background Debug Mode (USB-BDM) interface. An optional 6-pos
BDM_PORT header allows connecting an external HCS12/HCS08 BDM cable. This header is
not installed in default configurations.
Integrated BDM
The DEMO9S08SF4 board features an integrated Open Source BDM
(USB-BDM) based on
the Freescale MC9S08JM60 MCU. The integrated USB BDM supports application
development and debugging via background debug mode and provides primary power to the
development module. The integrated BDM is fully supported by CodeWarrior development
tools.
The integrated USB BDM provides power and ground to the target board eliminating the need
to power the board externally. Power from the USB BDM is derived from the USB bus. The
integrated USB BDM is designed to sink a maximum of 300mA of current from the USB bus.
Therefore, total current consumption for the target board, and connected circuitry,
must not
exceed 300mA
. This current limit describes the current supplied by the USB cable to the
BDM circuit, the target board, and any connected circuitry. Excessive current drain will violate
the USB specification causing the bus to disconnect. Damage to the host PC USB hub or the
target board may result.
BDM_PORT Header
A compatible HCS12 BDM cable may also attach to the 6-pin BDM interface header
(BDM_PORT). Figure 2 below shows the pin-out for the BDM_PORT header.
Figure 2: BDM_PORT Header
BKGD
1
2
GND
See the MC9S08SF4 Reference Manual for details
3
4
RESET*
5
6
VDD
NOTE:
The BDM_PORT header is not installed in default configuration.
POWER
The DEMO9S08SF4 may be powered from the integrated USB-BDM or from the MCU IO
connector at J1. The USB-BDM is designed to supply 5VDC or +3.3VDC to the target
MCU. The VOUT_SEL option jumper at JP1 selects the desired output voltage.
Power may also be applied to connector J1 or the board may be configured to supply power
from connector J1 to external circuitry.
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