Axiom DEMO908LB8 User manual

DOC-0341-010, REV A
Axiom Manufacturing •2813 Industrial Lane •Garland, TX 75041
Email: [email protected] Web: http://www.axman.com
DEMO908LB8
Demonstration Board for Freescale 68HC908LB8

DEMO908LB8 MARCH 24, 2005
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CONTENTS
CAUTIONARY NOTES ..............................................................................................................4
TERMINOLOGY.........................................................................................................................4
FEATURES ................................................................................................................................5
REFERENCE .............................................................................................................................6
OPERATING MODES................................................................................................................6
RUN MODE ........................................................................................................................... 6
MON08 MODE ......................................................................................................................7
SOFTWARE DEVELOPMENT...................................................................................................7
MEMORY MAP ..........................................................................................................................8
DEVELOPMENT SUPPORT......................................................................................................8
MON08 HEADER .................................................................................................................. 8
DEBUG CONNECTOR.......................................................................................................... 9
MON08 SETUP .....................................................................................................................9
POWER....................................................................................................................................10
TERMINAL BLOCK ............................................................................................................. 10
J1 POWER INPUT .............................................................................................................. 11
PWR_SEL ........................................................................................................................... 11
RESET SWITCH ......................................................................................................................12
LOW VOLTAGE INHIBIT.........................................................................................................12
TIMING.....................................................................................................................................12
OPAMP_EN .............................................................................................................................13
USER OPTIONS ......................................................................................................................13
PUSHBUTTON SWITCHES............................................................................................ 14
LED INDICATORS .......................................................................................................... 14
RV1 POTENTIOMETER.................................................................................................. 14
RZ1 PHOTOCELL........................................................................................................... 14
I/O CONNECTOR J1................................................................................................................14
APPENDIX A............................................................................................................................16
BILL OF MATERIALS.......................................................................................................... 16

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FIGURES
Figure 1: Memory Map ...............................................................................................................8
Figure 2: MON08 Debug Port .....................................................................................................9
Figure 3: DEBUG Connector ......................................................................................................9
Figure 4: MON08 Setup............................................................................................................10
Figure 5: TB1 Terminal Block Connector..................................................................................11
Figure 6: PWR_SEL Jumper Settings.......................................................................................12
Figure 7: OSC_EN Option Header ...........................................................................................13
Figure 8: MCU IO Connector ....................................................................................................15
TABLES
Table 1: Run Mode Setup...........................................................................................................6
Table 2: MON08 Mode Setup .....................................................................................................7
Table 3: OPAMP_EN Option settings.......................................................................................13
Table 4: USER_EN Option Settings .........................................................................................13
REVISION
Date Rev Comments
March 24, 2005 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 DEMO908LB8 board:
a) This product as shipped from the factory with associated power supplies and cables, has
been verified to meet with requirements the FCC 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 products operation from the
factory default as shipped may effect its performance and cause interference with other
apparatus in the immediate vicinity. If such interference is detected, suitable mitigating
measures should be taken.
TERMINOLOGY
This development board uses option selection jumpers. A jumper is a plastic shunt that con-
nects 2 terminals electrically. Terminology for application of the option jumpers is as follows:
Jumper on, in, or installed - jumper is installed such that 2 pins are connected together.
Jumper off, out, or idle - jumper is installed on 1 pin only. It is recommended that jump-
ers be idled by installing on 1 pin so they will not be lost.

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FEATURES
The DEMO908LB8 is an evaluation or demonstration board for the Freescale 68HC908LB8
microcontroller. Application development is quick and easy with the included DB9 serial cable,
sample software tools, and examples. A MON08 port is provided for development tool
application support and is compatible with HC08 monitor interface cables and software.
Debug monitor access is also supported through the DEBUG Port. A 28-pin MCU I/O
connector (J1) allows interfacing the DEMO908LB8 board to an external development
environment or external test equipment.
Features:
•68HC908LB8 CPU
•20 PDIP, Socketed
•8K Byte Flash EEPROM
•128 Bytes Ram
•17 Shared General Purpose IO Lines, 1 Input only IO
•2-Ch Lamp Control Module
•2-Ch PWM
•7-Ch, 8-bit ATD
•Op Amp / Comparator
•7 Key Board Wake-up Ports
•8Mhz Internal Bus Operation
•Low Voltage RESET
•Regulated +5V power supply
•Power Input Selection Jumper
•Power input from TB1
•Optional power input from Connector J1
•Optional power output through Connector J1
•9.8304 MHz Clock Oscillator w/ Enable
•RS-232 Serial DEBUG Port w/ DB9 Connector for optional
monitor access
•User Components Provided
•3 Push Switches; 2 User, RESET
•3 LED Indicators; 2 User, +5V
•Option Jumpers
•Enable User Components
•Power Select
•OSC_EN
•MON_EN
•VTST_EN
•OPAMP_EN
•Connectors
•28-pin MCU I/O Connector, stack through type
•2-Position, Screw-type, Power Input Terminal Block
•MON08 Debug Cable Header
•DB9 Serial DEBUG Connector
•Supplied with DB9 Serial Cable, Documentation (CD), and Manual.
Specifications:
Board Size 1.6” x 2.2”
Power Input: +6V to +16V

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REFERENCE
Reference documents are provided on the support CD in Acrobat Reader format.
DEMO908LB8_SCH_B.pdf DEMO908LB8 Board Schematic Rev. B
DEMO908LB8_UG_A.pdf DEMO908LB8 User Manual (this document)
DEMO908LB8_QSG.pdf DEMO908LB8 Quick Start Guide
MC68HC908LB8.pdf 68HC908LB8 Device User Guide
See the HC08 Support CD provided with this board for all the documentation and support files
provided.
OPERATING MODES
The DEMO908LB8 board operates in two basic modes Run Mode, or MON08 Debug Mode.
Run Mode supports user application operation from Power-On or Reset. MON08 Debug Mode
supports the development and debug of applications via the embedded debug monitor. See
the related sections below for quickly starting the board in the desired operation mode.
The board has been preloaded with a demonstration program. The demo program operates in
the Run Mode. The +5V LED will light when power is applied to the board. See the
DEMO908LB8 Quick Start Guide provided with the demonstration board for details on running
the demonstration program.
RUN Mode
Run mode allows user application to function when power is applied to the board. Use the
following settings to configure the DEMO908LB8 board for RUN Mode to get started quickly.
1. Connect auxiliary equipment to board as required by application.
2. Configure the board option jumpers for run mode.
Table 1: Run Mode Setup
PWR_SEL 2 (pin3 – pin4)
OSC_EN As needed
VTST_EN OFF
MON_EN OFF
USER ALL ON – As needed
OPAMP_EN OFF
3. Apply power to terminal block TB1. Limit power input between +6V and +20V.
4. The loaded application will begin to execute.

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MON08 Mode
MON08 Debug Mode supports application development and debug using the internal HC08
monitor. MON08 mode is available to the user through an external MON08 debug cable con-
nected to the 16-pin MON08 header. Alternately, a Serial MON08 interface is provided
through the DEBUG 9-pin DSUB connector. The steps below describe using the external
MON08 debug cable connected to the 16-pin MON08 header.
1. Connect auxiliary equipment to board as required by application.
2. Install and launch P&E PKG08Z tool set, CodeWarrior Development Studio, or other soft-
ware capable of communicating with the HC08 MCU.
3. Configure the board option jumpers for MON08 mode.
Table 2: MON08 Mode Setup
PWR_SEL 2 (pin3 – pin4)
OSC_EN ON
VTST_EN ON
MON_EN OFF
USER User5 OFF – others ON
as needed
OPAMP_EN As Required
NOTE: The USER5 feature (POT) connects to a
monitor mode configuration line. To ensure proper
monitor mode entry, remove the USER5 jumper.
NOTE: To enter Monitor Mode, voltage applied at TB1 must exceed +9V.
4. Connect power to terminal block TB1. Apply voltage between +9V and +20V.
5. Hosting development software will establish MON08 communication.
SOFTWARE DEVELOPMENT
Software development will require the use of an HC08 assembler or compiler and a host PC
operating a MON08 debug interface. Supplied with this board is the CodeWarrior Develop-
ment Studio for HC(S)08 along with the Axiom MON08 IDE for Windows for Debugging and
Flash programming.
A powerful source code generation tool called DriveWay™ is also provided on the support CD.
This can generate C source code for the HC08 microcontroller peripherals, based on setup.
See the DriveWay™readme.txt file for more information.

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MEMORY MAP
Figure 1: Memory Map
0x0000
0x0058 IO Registers 59 bytes
Unimplemented
0x0080
0x00FF RAM 128 bytes
Unimplemented
0X037E
0X061F
Flash Programming
Routine ROM 674 bytes
Unimplemented
0xDE00
0xFDFF Flash Memory 8192 bytes
0xFE00
0xFE0C Status & Control 12 bytes
Unimplemented
0xFE20
0xFF7D Monitor ROM 350 bytes
0xFF7E Flash Block Protect 1 byte
Unimplemented
0xFFC0 Internal Osc Trim 1 byte
Unimplemented
0xFFDE
0xFFFF Vectors 34 bytes
NOTE: Attempts to execute code from an unimplemented address
range will cause an illegal address RESET
NOTE: $FFF6 – $FFFD used for 8 security bytes
DEVELOPMENT SUPPORT
Application development and debug for the target MC68HC908LB8 is supported through the
MON08 debug interface. Monitor-mode access is available through the MON08 header and
through the DEBUG connector. The VTST_EN option jumper is used to force monitor mode
entry. This jumper must be installed as the MCU exits RESET to force monitor mode entry.
MON08 Header
A MON08 debug cable will attach to the 16-pin MON08 port. Several MON08 debug cables
supply VTST directly, thereby, eliminating the need to set the VTST_EN option jumper. The
MCU supports monitor mode communications at 9600 bps. Refer to MC68HC908LB8
documentation for further details.

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Figure 2: MON08 Debug Port
1 2 GND
3 4 PTA3/RST*
5 6 PTA2/IRQ*
See the HC08 Reference Manual for complete
MON08 documentation
7 8 PTA0
910 PTA4
11 12 PTA1
PTA5/OSC1 13 14
VDD 15 16
DEBUG Connector
Serial MON08 access is provided through a standard 9-pin DSUB connector. An RS-232
translator provides RS-232 logic level to TTL/CMOS logic level translation on the DEBUG port.
The figure below shows the DB9 connector pin-out. The VTST_EN jumper must be installed
as the MCU exits RESET to invoke monitor mode. The MON_EN option jumper enables serial
MON08 access. The MCU supports monitor mode communications at 9600 bps. Refer to
MC68HC908LB8 documentation for further details.
Figure 3: DEBUG Connector
16
TXD 27RTS
RXD 38CTS
49NC
GND 5
Female DB9 connector that interfaces to the HC08 internal SCI1 serial
port via the U2 RS232 transceiver. It provides simple 2 wire asynchro-
nous serial communications without flow control.
Pins 1, 4, and 6 are connected together for NULL status to the host
Pins 7, 8 are connected together for flow control if needed
MON08 Setup
The following figure shows the settings necessary to configure monitor mode operation. To
ensure seamless monitor mode entry, the user should remove the USER5 jumper as shown
below. The USER5 jumper enables the POT, which connects to monitor mode configuration
line PTA1. Failure to remove this jumper may prevent monitor mode entry.
Configure MON_EN jumper for the monitor mode access desired.

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Figure 4: MON08 Setup
MON_EN ON/OFF Enables MON08 communication through DEBUG connector. On
for serial access via DEBUG connector off for MON08 cable ac-
cess
VTST_EN ON Force MON08 Monitor Mode. Remove if using a powered MON08
debug cable.
OSC_EN ON/OFF Enable/Disable External Clock Oscillator if required
User-5 ••OFFDisable User-5 Function. May not enter monitor mode if not re-
moved.
NOTE: To enter the MON08 monitor mode, the input voltage must exceed +9V
NOTE: User-5 must be disabled to allow monitor mode entry
NOTE: Remove VTST_EN jumper if using a powered MON08 debug cable.
When using the MON08 cable to access monitor mode, the host software must be configured
properly. Many MON08 cables are capable to powering the target board through the MON08
header. In this case, the appropriate voltages will be applied to the board and the state of the
monitor configuration jumpers is DON’T CARE. If the board is not powered through the
MON08 Port, then the minimum voltage applied to the board is +9V and the VTST_EN jumper
must be installed. Regardless of how the board is powered, the state of the MON_EN jumper
is DON’T CARE when using a MON08 cable.
POWER
Input power may be applied by external connection to a 2 position terminal block or directly to
connector J1. The PWR_SEL option header determines the selected power input.
Terminal Block
The TB1 terminal block allows external voltage to be supplied to the board. For normal opera-
tion, input voltage should be limited to the range of +6V and +20V. The terminal block is a
3.55mm, screw-type, connector that accepts a maximum 18 AWG wire. An on-board voltage
regulator converts the input voltage to the +5V used by the board. Bulk capacitance on the
regulator input and output provides noise immunity and reduces ripple.
A large plus sign (+) adjacent to the terminal block input indicates the positive terminal. Use
care when connecting power to the terminal block. Reversing the power connections at TB1
may damage the board.