Axiom DEMO9S08SE8 User manual

DOC-0448-010 REV A
Email: www.axman.com
Support: [email protected]
DEMO9S08SE8
Demonstration Board for Freescale MC9S08SE8
Microcontroller
USER GUIDE

DEMO9S08SE8 JULY 29, 2008
USER GUIDE
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CONTENTS
CAUTIONARY NOTES ..............................................................................................................4
TERMINOLOGY.........................................................................................................................4
FEATURES ................................................................................................................................5
REFERENCES ...........................................................................................................................6
GETTING STARTED..................................................................................................................6
SOFTWARE DEVELOPMENT...................................................................................................6
MEMORY MAP ..........................................................................................................................6
DEVELOPMENT SUPPORT ......................................................................................................7
INTEGRATED BDM_PORT................................................................................................... 7
BDM_PORT HEADER........................................................................................................... 7
POWER ......................................................................................................................................7
POWER SELECT .................................................................................................................. 8
PWR_SEL.........................................................................................................................8
VX_EN............................................................................................................................... 9
RESET SWITCH ........................................................................................................................9
LOW VOLTAGE DETECT........................................................................................................10
TIMING.....................................................................................................................................10
COMMUNICAITONS................................................................................................................10
COM PORT ......................................................................................................................... 10
VIRTUAL SERIAL PORT..................................................................................................... 11
COM_SEL ........................................................................................................................... 11
COM CONNECTOR ............................................................................................................ 11
USER OPTIONS ......................................................................................................................12
PUSHBUTTON SWITCHES............................................................................................ 12
LED INDICATORS .......................................................................................................... 12
POTENTIOMETER.......................................................................................................... 12
PHOTOCELL................................................................................................................... 12
I/O PORT CONNECTOR..........................................................................................................13

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FIGURES
Figure 1: BDM Port.....................................................................................................................7
Figure 2: PWR_SEL Option Header ...........................................................................................8
Figure 3. VX_EN Option Header ...............................................................................................9
Figure 4: OSC_EN Option Header ...........................................................................................10
Figure 5: COM Connector.........................................................................................................12
Figure 6: MCU I/O Port Connector ...........................................................................................13
TABLES
Table 1: Memory Map.................................................................................................................6
Table 2: COM Connections ......................................................................................................11
Table 3: COM_EN Option Header ............................................................................................11
Table 4: User Option Jumper Settings......................................................................................13
REVISION
Date Rev Comments
July 29, 2008 A Initial Release

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CAUTIONARY NOTES
1) Electrostatic Discharge (ESD) prevention measures should be used when handling this
product. ESD damage is not a warranty repair item.
2) Axiom Manufacturing does not assume any liability arising out of the application or use of
any product or circuit described herein; neither does it convey any license under patent
rights or the rights of others.
3) EMC Information on the DEMO9S08SE8 board:
a) This product, as shipped from the factory with associated power supplies and cables,
has been verified to meet with FCC requirements as a CLASS A product.
b) This product is designed and intended for use as a development platform for hardware
or software in an educational or professional laboratory.
c) In a domestic environment, this product may cause radio interference in which case the
user may be required to take adequate prevention measures.
d) Attaching additional wiring to this product or modifying the product operation from the
factory configuration may affect its performance and cause interference with other appa-
ratus in the immediate vicinity. If such interference is detected, suitable mitigating
measures should be taken.
TERMINOLOGY
This development module utilizes option select jumpers to configure default board operation.
Terminology for application of the option jumpers is as follows:
Jumper – a plastic shunt that connects 2 terminals electrically
Jumper on, in, or installed = jumper is a plastic shunt that fits across 2 pins and the shunt is
installed so that the 2 pins are connected with the shunt.
Jumper off, out, or idle = jumper or shunt is installed so that only 1 pin holds the shunt, no 2
pins are connected, or jumper is removed. It is recommended that the jumpers be placed
idle by installing on 1 pin so they will not be lost.
Cut-Trace – a circuit trace connection between component pads. The circuit trace may be
cut using a knife to break the default connection. To reconnect the circuit, simply install a
suitably sized 0-ohm resistor or attach a wire across the pads.
Signal names followed by an asterisk (*) denote active-low signals.

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FEATURES
The DEMO9S08SE8 is an evaluation or demonstration board for the MC9S08SE8 microcon-
troller. Development of applications is quick and easy with the integrated USB-BDM, sample
software tools, and examples. An optional BDM_PORT port is also provided to allow use of a
BDM_PORT cable. A 40-pin connector allows connecting the DEMO9S08SE8 board to an ex-
panded evaluation environment.
•MC9S08SE8 CPU, 28SOIC
•8K Byte Flash
•512 Bytes RAM
•Internal 32 kHz Oscillator, trimmable to ±0.2%
•Timer Interface Module
•SCI Communication Ports
•8 KBI inputs
•2-Ch, 16-bit, Timer Interface
•8-Ch, 10-bit Analog to Digital Converter (ATD)
•Integrated USB-BDM
•RS-232 Serial Port w/ DB9 Connector
•External 32.768 kHz Clock Oscillator (not installed)
•Power Input Selection Jumper
•Power input from USB-BDM
•Power input from on-board regulator
•Power input from Connector J1
•Power output through Connector J1
•User Components Provided
•3 Push Switches; 2 User, 1 Reset
•3 LED Indicators; 2 User, 1 VDD
•Jumpers
•USER_EN
•PWR_SEL
•COM_SEL
•VX_EN
•OSC_EN (not installed)
•JP301, JP302
•Connectors
•32-pin MCU I/O Connector
•2.0mm Barrel Connector
•BDM_PORT Pin Header (not installed)
•DB9 Serial Connector
•USB-B Connector
Specifications:
•Board Size 3.0” x 3.0”
•Power Input:
•USB Cable – 500mA max
•PWR Connector - 9VDC typical, +7VDC to +18VDC

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REFERENCES
Reference documents are provided on the support CD in Acrobat Reader format.
DEMO9S08SE8_UG.pdf DEMO9S08SE8 User Guide (this document)
DEMO9S08SE8_SCH_C.pdf DEMO9S08SE8 Board Schematic, Rev. C
GETTING STARTED
To get started quickly, please refer to the DEMO9RS08SE8 Quick Start Guide. This quick
start will help the user connect the board to a PC, install the correct version of CodeWarrior
Development Studio, and run a simple demo program.
SOFTWARE DEVELOPMENT
Software development requires the use of an HCS08 assembler or compiler and a host PC
running a BDM interface. CodeWarrior Development Studio is supplied with this board for de-
bugging and flash programming.
MEMORY MAP
The table below shows the MC9S08SE8 memory map. Attempting to access unimplemented
memory locations causes an illegal-address reset. The memory map is grouped into 3 broad
categories; Registers, RAM, and Flash. In the memory map below, the non-volatile registers
and vector table are located at the top of the Flash block.
Table 1: Memory Map
0x0000
0x007F
Direct Page Registers
0x0080
0x027F
RAM
0x0280 –
0x17FF
Unimplemented
0x 1800 –
0x185F
High Page Registers
0x1860 –
0xDFFF
Unimplemented
0xE000 –
0xFFFF
FLASH
NOTE: Accessing unimplemented memory locations causes an illegal-address reset.

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DEVELOPMENT SUPPORT
Application development and debug for the target MC9S08SE8 is supported through the BDM
interface. The debug interface consists of an integrated USB-BDM debugger and an optional
6-pin header (BDM_PORT). The BDM_PORT header is not installed in default configuration
and may be installed by the user if needed.
Integrated BDM_PORT
The DEMO9S08SE8 board features an integrated USB-BDM debugger from P&E Microcom-
puter Systems. The integrated debugger supports application development and debugging via
the background debug mode. A USB, type B, connector provides connectivity between the
target board to the host PC.
The integrated debugger provides power and ground to the target, thereby eliminating the
need to power the board externally. When used, power from the USB-BDM circuit is derived
from the USB bus; therefore, total current consumption for the target board, and all connected
circuitry, must not exceed 500mA. Excessive current drain will violate the USB specification
causing the USB bus to disconnect; power is removed from the target forcing a POR.
CAUTION: Violating the USB specification will cause the USB bus to disconnect forcing the
target to reset.
BDM_PORT Header
An HCS08/HC(S)12 BDM cable may be attached to a 6-pin BDM_PORT port header. How-
ever, this header is not installed in default configuration. Use of this port requires the user to
install a 2x3, 0.1” center, pin header. Refer to the BDM cable documentation for details on the
use of the BDM cable. The BDM_PORT header pin-out is shown below.
Figure 1: BDM Port
PTA4/ BKGD 1 2 GND
3 4 PTA5/RESET*
5 6 VDD
See the HCS08 Reference Manual for
complete BDM_PORT documentation
NOTE: This header is not installed in default configuration.
POWER
The DEMO9S08SE8 is designed to be powered from the USB_BDM during application devel-
opment. A 2.0mm barrel connector has been applied to support stand-alone operation. In ad-
dition, the board may be powered through connector J1. The board may also be configured to
supply power through connector J1 to external circuitry.

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When using the integrated USB-BDM, the board draws power from the USB bus. Total cur-
rent consumption of the board and connected circuitry, therefore, must be limited to less than
500mA. Excessive current drain will violate the USB specification causing the USB bus to dis-
connect. This will force a power-on-reset (POR).
CAUTION: Violating the USB specification will cause the USB bus to disconnect, forcing the
target to reset.
A 2.0mm, center-positive, barrel connector input has been provided to allow stand-alone op-
eration. Voltage input at this connector must be limited to between +5V and +18V. An LDO
voltage regulator at VR1 converts the input voltage to the +5.0V rail on the target board. VR1
will shut down if the connected circuit draws excessive current. Stand-alone operation is also
supported through connector J1.
POWER SELECT
Power may be applied to the board through the integrated USB-BDM circuitry, the 2.0mm bar-
rel connector, or through connector J1. Power selection is achieved by using 2 option head-
ers: PWR_SEL option header and the VX_EN option header.
The PWR_SEL option header selects power input either from the integrated USB-BDM cir-
cuitry or from the on-board voltage regulator. Power input selection, from the USB-BDM or the
on-board power supply, is mutually exclusive. This prevents power-input contention from
damaging the board. The figure below details the PWR_SEL header connections.
PWR_SEL
Figure 2: PWR_SEL Option Header
PWR_SEL CONFIGURATION:
VB VDD
▪▪▪ Select power input from USB-BDM
PWR_SEL
VB VDD
▪▪▪ Select power input from VR1
Power from the integrated BDM is drawn from the USB bus and is limited to 500mA. Exces-
sive current drain will violate the USB specification will cause the USB bus to disconnect.
CAUTION: Violating the USB specification will cause the USB bus to disconnect. This will
cause the board to reset.

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The on-board voltage regulator (VR1) accepts power input through a 2.0mm barrel connector
(PWR). Input voltage may range from +5V to +18V. The voltage regulator (VR1) provides a
+5.0V fixed output limited to 500mA. Over-temperature and over-current limits built into the
voltage regulator protects the device from excessive stresses.
The user should consider the maximum output current limit of the selected power source when
attempting to power off-board circuitry through connector J1.
VX_EN
The VX_EN option header is a 2-pin jumper that connects the target board voltage rail to J1-1.
J1-3 is connected directly to the ground plane. Use of this feature requires a regulated +5.0V
input power source. This power input is decoupled to minimize noise input but is not regu-
lated. 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 be sourced to off-board circuitry through the J1 connector. The current limitation of
the USB bus or the on-board regulator must be considered when attempting to source power
to external circuitry. Excessive current drain may damage the target board, the host PC USB
hub, or the on-board regulator. The figure below details the VX_EN option header connec-
tions.
Figure 3. VX_EN Option Header
ON Enable power connection to connector J1
VX_EN
▪ ▪ OFF Disable power connection to connector J1
VX_EN
CAUTION: Do not apply power to connector J1 while also sourcing power from either the
PWR connector or the USB-BDM circuit. Damage to the board may result.
NOTE: Do not exceed available current supply from the USB-BDM cable or on-board regulator
when sourcing power through connector J1 to external circuitry.
RESET SWITCH
The RESET switch provides a method to apply an asynchronous reset to the MCU and is con-
nected directly to the PTA5/RESET* input on the MCU. Pressing the RESET switch forces the
MCU RESET* input low. The MC9S08SE8 MCU applies an internal pull-up on the RESET*
line to prevent spurious resets and allow normal operation.
The RESET* input on the MC9S08SE8 is multiplexed. Refer to the MC9S08SE8 Reference
Manual for details on using this input.

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LOW VOLTAGE DETECT
The MC9S08SE8 utilizes an internal Low Voltage Detect (LVD) to protect against under-
voltage conditions. The LVD is enabled out of RESET. Consult the MC9S08SE8 Reference
Manual for details on configuring LVD operation.
TIMING
By default, the DEMO9S08SE8 uses timing provided from an internal 32 kHz frequency refer-
ence and an internal frequency-locked loop (FLL). The FLL output is trimmable to ± 0.2% of
nominal. Refer to the MC9S08SE8 Reference Manual for further details on clock operation.
Component pads for an optional 32.768 kHz crystal oscillator circuit have also been provided
to support external timing input. The external crystal is connected to the PTB6/XTAL and
PTB7/EXTAL MCU inputs. This alternate timing source is configured for Pierce mode opera-
tion.
The alternate timing source components are not installed in default configurations. Refer to
the board schematic to populate this option and associated support components.
Figure 4: OSC_EN Option Header
▪ ▪ ON Enables Crystal Oscillator Input to MCU
OSC_EN
▪ ▪ OFF
OSC_EN
NOTE: This option header is not installed in default configuration.
COMMUNICAITONS
Serial communications on the DEMO9S08SE8 board are support through an RS-232 physical
layer interface and DB-9 connector and through a virtual serial port implemented in the USB-
BDM. The COM_SEL option header selects between the applied serial function.
COM Port
An RS-232 transceiver provides RS-232 to TTL/CMOS logic level translation between the
COM connector and the MCU. The COM connector is a 9-pin Dsub, right-angle connector. A
ferrite bead on shield ground provides conducted immunity protection. Communication signals
TXD and RXD are routed from the transceiver to the MCU. These signals are also available
on connector J1. Hardware flow control signals RTS and CTS are available on the logic side
of U3 and are routed to test point vias located near the transceiver (U4). RTS has been biased
properly to provide handshaking if required.