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D E M O 9 0 8 L B 8

M A R C H 2 4 , 2 0 0 5

Figure 8: MCU IO Connector

PTC2/SHTDWN/IRQ*

GND

PTA5/RST*/BKI5

PTA0/ADC0/KBI0

PTC0/OSC1

PTA1/ADC1/KBI1

PTC1/OSC2

PTA2/ADC2/KBI2

PB2/FAULT

PTA3/ADC3/KBI3

PTB5/V+

PTB3/PWM0

PTB56/V-

PTB4/PWM1

PTB7/VOUT/ADC6/FAULT

PTB0/TOP

PTA4/ADC4/KBI4

PTB1/BOT

PTA6/ADC5/TCH0/KBI6

NOTE

: Power output from the board is limited by the 250 mA maximum output of

the on-board voltage regulator.

Summary of Contents for DEMO908LB8

Page 1: ...D O C 0 3 4 1 0 1 0 R E V A Axiom Manufacturing 2813 Industrial Lane Garland TX 75041 Email Sales axman com Web http www axman com DEMO908LB8 Demonstration Board for Freescale 68HC908LB8 ...

Page 2: ...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 ...

Page 3: ...ON08 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 ...

Page 4: ...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 vicini...

Page 5: ...d 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 Por...

Page 6: ...e 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 app...

Page 7: ...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 M...

Page 8: ...ress 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 a...

Page 9: ...at 9600 bps Refer to MC68HC908LB8 documentation for further details Figure 3 DEBUG Connector 1 6 TXD 2 7 RTS RXD 3 8 CTS 4 9 NC 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 ...

Page 10: ...iguration 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 ...

Page 11: ...power external circuitry connector J1 supplies voltage directly from the on board voltage regulator This output provides a regulated 5V 5 output to connector J1 The current limit of the regulator must be considered when using this feature PWR_SEL Power routing on the DEMO908LB8 is determined by the PWR_SEL option header The PWR_SEL header is also be used to configure the board to supply voltage to...

Page 12: ...unt capacitance ensures an adequate input pulse width LOW VOLTAGE INHIBIT The MC68HC908LB8 applies an internal Low Voltage Inhibit LVI protect against under voltage conditions The LVI is enabled out of RESET Consult the MC68HC908LB8 reference manual for details on configuring LVI operation TIMING The MCU provides an internal 16MHz timing source out of RESET By default the internal timing source ex...

Page 13: ...vides 2 push button switches 2 LED indicators a potentiometer and a photocell circuit for use in application development The photocell is connected to a gain stage amplifier internal to the MCU The USER_EN option header allows each option to be enabled or disabled individually To enable a user option simply install the appropriate jumper Re move the jumper to disable an option The table below whic...

Page 14: ...ce provides a 0 to VDD 5V typical output to the PTA1 MCU input when enabled The POT is enabled by the USER option bank The POT is connected to the HC08 I O port PT1 RZ1 Photocell A visible light sensitive photocell RZ1 is connected to the internal OP AMP Comparator at PTB5 PTB7 Vout and PTB6 V provide the feedback circuit used to control the OP AMP gain Sensor output voltage ranges between 5V to V...

Page 15: ...1 PTA1 ADC1 KBI1 7 8 PTC1 OSC2 PTA2 ADC2 KBI2 9 10 PB2 FAULT PTA3 ADC3 KBI3 11 12 PTB5 V PTB3 PWM0 13 14 PTB56 V PTB4 PWM1 15 16 PTB7 VOUT ADC6 FAULT PTB0 TOP 17 18 PTA4 ADC4 KBI4 PTB1 BOT 19 20 PTA6 ADC5 TCH0 KBI6 21 22 23 24 25 26 27 28 NOTE Power output from the board is limited by the 250 mA maximum output of the on board voltage regulator ...

Page 16: ...5K ohm 3 8 horz adj W knob RV1 Bourns 14 1 Photocell 30K 1M RZ1 Photonic PDV P9003 15 1 Diode Zener 8 2V 5 225mW SOT23 D1 On Semiconductor MMBZ5237BLT1 16 1 Diode Schottky 30V 200mA BAT54C Com Cathode SOT23 D2 General Sem 17 3 LED Green w reflector 1206 SMT LED1 LED2 5V Rohm SML 010MTT86 18 1 VReg LDO 5V 250mA 8 SOIC VR1 STMicroelectronics L4931CD50 19 1 IC MCU MC68HC908LB8 20 DIP U1 Freescale MC6...

Page 17: ... 2 0 0 5 17 29 1 Conn 2x8 Pin Header 1 Ctr Thru MON08 30 1 Socket IC 20 DIP MP SU1 31 12 Hdw Shunt 2 Pos 1 Generic 32 2 Hdw Stand off 250x 375 Hex Alum Keystone 2202 33 2 Hdw Screw 4 40x3 8 18 8 SS 34 1 PCB DEMO908LB8 2 layer 1 6 x 2 2 ...

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