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DEMO9S08EL32AUTO

P1-P3P4-P6P7-P9P10-P12P13-P14
DEMO9S08EL32 AUGUST 7, 2008
USER GUIDE
7
DEVELOPMENT SUPPORT
Application development and debug for the target MC9S08EL32 is supported through a
background debug mode (BDM) interface. The BDM interface consists of an integrated USB
BDM and a 6-pin interface header (BDM_PORT). The BDM_PORT header allows connecting
a HCS12/HCS08 BDM cable.
Integrated BDM
The DEMO9S08EL32 board features an integrated USB BDM. The integrated USB BDM
supports application development and debugging via background debug mode. All necessary
signals are provided by the integrated USB BDM. A USB, type B, connector provides
connection from the target board to the host PC.
The integrated USB BDM provides +5V power and ground to target board eliminating the need
to power the board externally. Power from the USB BDM is derived from the USB bus;
therefore, total current consumption for the target board, and connected circuitry, must not
exceed 500mA. 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 can also attach to the 6-pin BDM interface header
(BDM_PORT). This header is not installed in default configuration. Figure 1 below shows the
pin-out for the BDM_PORT header. This information is included for completeness.
Figure 1: BDM_PORT Header
BKGD
1 2
GND
3 4
RESET*
5 6
VDD
See the MC9S08EL32 Data Sheet for complete
DEBUG documentation
NOTE: This header is not installed in default configuration.
POWER
The DEMO9S08EL32 is designed to allow the user to power the board through the USB BDM
during application development. A 2.0-mm barrel connector has been applied to support
stand-alone operation and to support LIN functionality. The board may also be powered
through connector J1. This connection may also be used to supply power from the board to
external circuitry. Optionally, the board may be powered from the LIN connectors.
DEMO9S08EL32 AUGUST 7, 2008
USER GUIDE
8
During application development, the board may be powered from either the USB-BDM or the
PWR connector. To utilize LIN functionality, however, the board must be powered from the
LIN bus or from PWR connector with an input voltage greater than +12VDC.
POWER SELECT
Power may be applied to the board through the integrated USB BDM circuitry, a 2.0mm barrel
connector, or through connector J1. Power selection is achieved using 2 selection headers:
PWR_SEL option header and the VX_EN option header.
PWR_SEL
The PWR_SEL option header selects power input either from the integrated USB BDM
circuitry or from the on-board voltage regulator. Figure 2 below details the PWR_SEL header
connections.
Figure 2: PWR_SEL Option Header
VB
VDD
1 2 3
Selects power input from USB-BDM
PWR_SEL
VB
VDD
1 2 3
Selects power input from on-board regulator or J1
PWR_SEL
NOTE: Set PWR_SEL jumper to VB during application development. Use barrel connector
input (PWR) to support LIN functionality if needed.
Power from the integrated BDM is drawn from the USB bus and is limited to 500 mA. This
current limit accounts for the total current supplied over the USB cable to the BDM circuit, the
target board, and any connected circuitry. Current drain in excess of 500 mA will violate the
USB specification and will cause the USB bus to disconnect. This will cause the board to
exhibit power cycling where the board appears to turn-on then off continually. Damage to the
host PC or the target board may also result.
The on-board voltage regulator (VR1) accepts power input through a 2.0mm barrel connector
(PWR). Input voltage may range from +6V to +18V. The voltage regulator (VR1) provides a
+5V fixed output limited to 250mA. Over-temperature and over-current limit built into the
voltage regulator provides protection from excessive stress. The user should consider the
maximum output current limit of VR1 when attempting to power off-board circuitry through
connector J1.
DEMO9S08EL32 AUGUST 7, 2008
USER GUIDE
9
If powered from the PWR connector, the integrated BDM may still be used to develop and
debug application code. Alternately, the board may be powered from the integrated BDM
while the LIN bus is powered from the PWR connector.
VX_EN
The VX_EN option header is a 2-pin jumper that connects or disconnects input J1-1 directly to
the target board, +5V voltage rail. J1-3 is directly connected to the ground plane. Use of this
feature requires a regulated +5V input power source. This power input is decoupled to
minimize noise but is not regulated. Care should be exercised when using this feature; no
protection is applied on this input and damage to the target board may result if over-driven.
Also, do not attempt to power the target board through this connector while also applying
power through the USB BDM or the PWR connector; damage to the board may result.
Power may also be sourced to off-board circuitry through the J1 connector. The current
supplied from the USB bus or the on-board regulator limits current available to external
circuitry. Excessive current drain may damage the target board, the host PC USB hub, or the
on-board regulator. Figure 3 below details the VX_EN header connections.
Figure 3: VX_EN Option Header
ON OFF
1 2
Enabled Disabled
VX_EN
CAUTION: Do not exceed available current supply from USB BDM or on-board regulator, when
sourcing power through connector J1 to external circuitry.
RESET SWITCH
The RESET switch applies an asynchronous RESET to the MCU. The RESET switch is
connected directly to the RESET* input on the MCU. Pressing the RESET switch applies a
low voltage level to the RESET* input. A pull-up bias resistor allows normal MCU operation.
Shunt capacitance ensures an adequate input pulse width.
LOW VOLTAGE RESET
The MC9S08EL32 utilizes an internal Low Voltage Detect (LVD) circuit. The LVD holds the
MCU in reset until applied voltage reaches an appropriate level. The LVD also protect against
under-voltage conditions. Consult the MC9S08EL32 reference manual for details LVD
operation.
P1-P3P4-P6P7-P9P10-P12P13-P14

DEMO9S08EL32AUTO

Mfr. #:
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Manufacturer:
NXP / Freescale
Description:
Development Boards & Kits - S08 / S12 EL32 DEMO BOARD AUTO
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