Axiom M52233DEMO User manual

DOC-0384-010, REV C
Axiom Manufacturing •2813 Industrial Lane •Garland, TX 75041
Email: [email protected] Web: http://www.axman.com
M52233DEMO
Demonstration Board for Freescale MCF52233

M52233DEMO SEPTEMBER 25, 2006
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CONTENTS
CAUTIONARY NOTES ..............................................................................................................4
TERMINOLOGY.........................................................................................................................4
FEATURES ................................................................................................................................5
REFERENCES ...........................................................................................................................6
GETTING STARTED..................................................................................................................6
SOFTWARE DEVELOPMENT...................................................................................................7
OPERATING MODES ................................................................................................................7
RUN MODE ........................................................................................................................... 7
DEBUG MODE ......................................................................................................................8
MEMORY MAP ..........................................................................................................................8
DEVELOPMENT SUPPORT ......................................................................................................8
BDM_PORT HEADER........................................................................................................... 9
INTEGRATED BDM_PORT................................................................................................... 9
POWER ....................................................................................................................................10
POWER JACK................................................................................................................. 10
TERMINAL BLOCK......................................................................................................... 11
CONNECTOR J1............................................................................................................. 11
VDD LED.........................................................................................................................11
POWER SWITCH................................................................................................................ 11
POWER SELECT ................................................................................................................ 12
PWR_SEL....................................................................................................................... 12
VX_EN............................................................................................................................. 12
RESET......................................................................................................................................13
RESET SWITCH ................................................................................................................. 13
LOW VOLTAGE DETECT ................................................................................................... 13
RESET INDICATOR............................................................................................................ 13
LOW-POWER MODES ............................................................................................................14
TIMING.....................................................................................................................................14
COMMUNICATIONS................................................................................................................14
SCI PORT............................................................................................................................ 14
COM_EN......................................................................................................................... 14
COM CONNECTOR........................................................................................................ 15
SPI PORT............................................................................................................................ 15
IIC PORT............................................................................................................................. 15
ETHERNET ..............................................................................................................................15
ACCELEROMETER.................................................................................................................16
USER OPTIONS ......................................................................................................................16

M52233DEMO SEPTEMBER 25, 2006
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PUSHBUTTON SWITCHES............................................................................................ 17
USER LED’S ................................................................................................................... 17
POTENTIOMETER.......................................................................................................... 17
I/O PORT CONNECTOR..........................................................................................................18
FIGURES
Figure 1: BDM_PORT.................................................................................................................9
Figure 2: PWR Jack..................................................................................................................10
Figure 3: BATT Terminal Block.................................................................................................11
Figure 4: OFF/ON Switch .........................................................................................................11
Figure 5: PWR_SEL Option Header .........................................................................................12
Figure 6. VX_EN Option Header .............................................................................................13
Figure 7: COM Connector.........................................................................................................15
Figure 8: LED_EN Option Header ............................................................................................17
Figure 9: POT_EN Option Header............................................................................................18
Figure 10: Connector J1 ...........................................................................................................18
TABLES
Table 1: Default Jumper Configuration .......................................................................................6
Table 2: Run Mode Setup...........................................................................................................7
Table 3: Debug Mode Setup.......................................................................................................8
Table 4: COM_EN Option Header ............................................................................................15
Table 5: Ethernet Port Status LED’s.........................................................................................16
Table 6: ACC_EN Option Header.............................................................................................16
Table 7: User Option Connections............................................................................................17
REVISION
Date Rev Comments
March 16, 2006 A Initial Release.
April 26, 2006 B Updated Getting Started Section. Corrected EMC
classification
September 25, 2006 C Modified Getting Started section to point to Hands-On
Seminar documentation from Freescale.

M52233DEMO SEPTEMBER 25, 2006
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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 M52233DEMO 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 Aproduct.
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 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 jumpers be
idled by installing on 1 pin so they will not be lost.

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FEATURES
The M52233DEMO is a low-cost development system for the Freescale MCF52233 ColdFire
microcontroller. Application development is quick and easy with the included DB9 serial cable,
and integrated BDM. CodeWarrior Development Tools are also provided to support applica-
tion development and debug. The integrated BDM allows easy application development and
debugging. An optional BDM port compatible with standard ColdFire BDM / JTAG interface
cables and hosting software is provided but not installed,
Features:
•MCF52233 CPU, 80 pins
•256 Byte Flash
•32K Byte Ram
•DMA Controller w/ Timers
•Programmable Interrupt Timer
•8ch, 12b ADC
•QSPI, IIC, and CAN Serial Ports
•Fast Ethernet Controller (FEC) and Ethernet
Phy (ePHY)
•3 x UART Serial Ports with DMA capability
•4 GPT Timers
•BDM / JTAG Port
•3.3V operation
•60 MHz Internal Bus
•40 pin I/O port
•Ethernet port
•Integrated USB BDM port
•BDM / JTAG Port (not installed)
•RS-232 Serial Port w/ DB9-S Connector
•External XTAL, 25 MHz
•ON/OFF Power Switch w/ LED indicator
•RESET switch w/ indicator
•Power Input Selection Jumper
•Power Input from USB BDM
•Power Input from on-board, +3.3V, regulator
•Power Input from terminal block
•Power from connector J1
•Optional Power output through connector J1
•User Features
•3-axis Accelerometer
•4 User LED’s w/ enable
•2 User Push Switches
•5k ohm POT w/ enable
•Option Jumpers
•Power Input Select
•Optional Power Output Enable
•BDM_EN
•XTAL_EN
•POT_EN
•COM_EN
•LED_EN
•Connectors

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•RJ-45 Ethernet Connector
•Type B USB connector
•DB9 Serial Connector
•2.0mm Barrel Power Input
•2pos, screw type, terminal block
•Supplied with DB9 Serial Cable, USB cable, Ethernet Cable, Support CD, and CodeWarrior Development
Studio CD
Specifications:
Board Size 3.0” x 43.0”
Power Input: +5 - +1520VDC, 9VDC typical
REFERENCES
Reference documents are provided on the support CD in Acrobat Reader format.
M52233DEMO_UG.pdf M52233DEMO User Guide (this document)
M52233DEMO_SCH_D.pdf M52233DEMO Schematic, Rev D
M52233DEMO_Silk_D.pdf M52233DEMO Top Silkscreen, Rev D
CFPRM.pdf ColdFire Programmers Reference Manual
AZ131.pdf Hands-On Workshop: Dynamic Web Page
Server with the MCF5223x Family
ColdFire_Web_Server_with_Labs_Axman.zip Example file for use with Hands-On Workshop:
GETTING STARTED
The M52233DEMO ships from the factory with a USB stack and open-source RTOS from In-
terNiche Technologies preloaded. Refer to the Hands-On Workshop: Dynamic Web Page
Server with MCF5223x Family (AX131.pdf) on the Axiom Support CD for details on how to get
started quickly. Table 1 below shows the default jumper configuration for the M52233DEMO.
Table 1: Default Jumper Configuration
●● ●
VB VDD
Selects power input from integrated USB
BDM
PWR_SEL
●● ●
●● ●
VX EN
BDM EN
POT EN
POT_EN must be installed.
BDM_EN and VX_EN jumpers are "don’t
care" and may be left on or taken off. These
shunts are installed at the factory.
LED_EN ●● ON Enable user LED’s
CTS ●● ON
RTS ●● ON
CTS and RTS are “don’t care”
RXD ●● ON Enable RS-232 communications
TXD ●● ON

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SOFTWARE DEVELOPMENT
Software development requires using a ColdFire assembler or compiler and a host PC running
a ColdFire BDM interface. CodeWarrior Special Edition, supplied with this board, allows the
user to develop and debug application code and to program flash.
One method to ensure successful application development is to load and execute the applica-
tion from internal RAM. After the application has been completely debugged, and is fully func-
tional, it can be ported to FLASH. When programmed into FLASH, the application will execute
from Power-On or RESET if the RESET vector is programmed.
OPERATING MODES
The M52233DEMO board operates in two basic modes Run Mode, or Debug Mode. Run
Mode executes user application code from Power-On or Reset, if the RESET vector is pro-
grammed. Debug Mode supports the development and debug of applications via the inte-
grated USB BDM. An optional BDM_PORT is provided but not installed. See the related sec-
tions below for quickly starting the board in the desired mode of operation.
The board has been preloaded with a USB stack and open-source RTOS. Refer to the
GETTING STARTED section of this document for further details.
RUN Mode
Run mode executes the user application out of FLASH when power is applied to the board or
the RESET button is pressed. Of course, the RESET vector must be programmed to allow
application code to execute. Use the following settings to configure the M52233DEMO for
RUN Mode using the USB bus to power the board. See the POWER section below for details
on configuring the board for alternate power input.
1. Connect a serial cable and Ethernet cable between the board and a host PC if required.
2. Connect auxiliary equipment to board if required.
3. Configure the board option jumpers as shown.
Table 2: Run Mode Setup
PWR_SEL Set to VB
BDM_EN OFF
COM_EN ALL ON (if required)
VX_EN ON (if required)
LED_EN ON (if required)
4. Connect the USB cable to an open USB port on the host PC and attach to the USB port on
the target board. LED’s D301 and D302 located adjacent to the USB connector, and the

M52233DEMO SEPTEMBER 25, 2006
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VDD LED will light and the loaded application will begin to execute, if the RESET vector
has been programmed.
Debug Mode
Debug Mode supports application development and debug using the ColdFire background de-
bug module (BDM). Background mode is accessible using either the integrated USB-BDM or
an external ColdFire BDM cable. Using the integrated BDM requires a host PC with an avail-
able USB port and an A/B USB cable and appropriate hosting software. The USB cable must
be USB 2.0 compliant. An external BDM cable can be attached to the 26-pin BDM_PORT
header. However, this header is not installed in default configurations. The steps below de-
scribe using the integrated USB-BDM. See the POWER section below for details on configur-
ing the board for alternate power input.
1. Connect a serial cable and ethernet cable between the board and a host PC if required.
2. Connect auxiliary equipment to board if required.
3. Install and launch CodeWarrior 6.1 Special Edition, or other software capable of communi-
cating with the ColdFire MCU.
4. Configure the board option jumpers as shown.
Table 3: Debug Mode Setup
PWR_SEL Set to VB
BDM_EN ON
COM_EN ALL ON (if required)
VX_EN ON (if required)
LED_EN ON (if required)
5. Connect the supplied USB cable between an available USB port on the host PC and the
USB connector on the board. LED’s D301 and D302 located adjacent to the USB connec-
tor, and the VDD LED will light. Hosting development software will establish background
communication.
MEMORY MAP
Refer to the MCF52235 Integrated Microcontroller Reference Manual for details. The latest
version can be downloaded from the Freescale web site at www.freescale.com.
DEVELOPMENT SUPPORT
Application development and debug for the target MCF52233 is supported through the BDM
interface. The debug interface consists of an optional 26-pin header (BDM_PORT) and an in-
tegrated USB-BDM debugger. The BDM_PORT header is not installed in default configuration

M52233DEMO SEPTEMBER 25, 2006
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but may be installed by the user if needed. Refer to the MCF52235 Integrated Microcontroller
Reference Manual for details on using the Background Debug Module
Optional JTAG access is also supported through the BDM_PORT header. To use this optional
JTAG access, open the cut-trace between pin 1 and pin 2 of the BDM_SEL option header. In-
stall a standard 1x3 header at location BDM_SEL and install a shunt between pin 2 and pin 3.
Refer to the MCF52235 Integrated Microcontroller Reference Manual (www.freescale.com) for
details on using the JTAG port access.
BDM_PORT Header
A ColdFire BDM cable may be attached to the 26-pin BDM_PORT port header. This header is
not installed in default configuration. Its use requires installing a 2x13, 0.1” center, pin-header.
Refer to the BDM documentation, in the device reference manual, for details on using the BDM
cable. The BDM_PORT header pin-out is shown below.
Figure 1: BDM_PORT
NC 1 2 BKPT*
GND 3 4 DSCLK
GND 5 6 TCLK (JTAG)
RSTI* 7 8 DSI
Refer to the MCF52235 Integrated Microcon-
troller Reference Manual for details on using
the BDM_PORT
VDD 910 DSO
GND 11 12 ALLPST
ALLPST 13 14 ALLPST
ALLPST 15 16 NC
NC 17 18 NC
NC 19 20 GND
NC 21 22 NC
GND 23 24 TCLK (BDM)
VDD 25 26 TA*
NOTE: This header is not installed in default configuration.
Integrated BDM_PORT
The M52233DEMO board features an integrated USB-BDM debugger. The integrated debug-
ger supports application development and debugging via the background debug mode. A type
B, USB connector provides connectivity between the target board to the host PC.
NOTE: Using the integrated USB BDM requires CodeWarrior 6.1 Special Edition or develop-
ment tools from P&E Microcomputer Systems.
The integrated debugger provides power and ground to the target, thereby eliminating the
need to power the board externally. Power from the integrated USB-BDM is derived from the
USB bus and total current consumption is limited by the USB specification. Total current con-
sumption for the target board, and all connected circuitry, must not exceed 500mA. Excessive

M52233DEMO SEPTEMBER 25, 2006
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current drain will violate the USB specification causing the bus to disconnect. This will force a
target POR.
CAUTION: Violating the USB specification will cause the USB bus to disconnect forcing the
target to reset.
POWER
The M52233DEMO is designed to allow application development while powered from the
USB_BDM. A 2.0mm barrel connector and a 2-position, screw-type, terminal block (BATT)
has been applied to support stand-alone operation. The board may also be powered through
connector J1. Additionally, the board may be configured to supply power through connector J1
to external circuitry. An OFF/ON switch allows the user to quickly and easily connect and dis-
connect all power sources.
When using the integrated USB-BDM, the board draws power from the USB bus. Excessive
current drain will violate the USB specification causing the USB bus to disconnect forcing a
POR. Total current consumption of the board and connected circuitry, therefore, must be less
than 500mA.
CAUTION: Violating the USB specification will cause the USB bus to disconnect. This will
force a hard reset on the target.
The installed barrel connector accepts a center-positive, 2.1m barrel plug. The terminal block
accepts wire sizes ranging from 28ga to 16ga. Voltage input must be in the range between
+5V and +15V. At no time should input voltage exceed +15V as damage to the board may re-
sult. The terminal block input is connected directly to the upper voltage rail. Input protection is
not applied on this voltage input. The user must exercise caution when using the terminal
block to input power to the board.
Voltage supplied through connector J1 is also connected directly to the board voltage rails. No
protection is applied on this input and the user must exercise caution when powering the board
from connector J1.
CAUTION: Input protection is NOT applied to the J1 or BATT power inputs. Excessive input
voltage or current will damage the board.
POWER JACK
The PWR power jack consists of a 2.1mm, center-positive, barrel connector. Voltage applied
at this connector should range between +5V and +15V.
Figure 2: PWR Jack
2.0mm – 2.1mm, center-positive, +V input
Applied voltage: +5V - +15V
PWR

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Terminal Block
The BATT terminal block is a 3.5mm, screw-type terminal block connected directly to the VDD
voltage rail. This allows the use of 2 AA batteries to supply power to the board. Exercise cau-
tion when using this input since input protection is not applied. This input requires a regulated
+3.3V voltage source.
Figure 3: BATT Terminal Block
Accepts wire size 28AWG – 16AWG
Applied voltage must be +3.3V.
-
BATT
+
Connector J1
See the schematic for details on using this connection to supply power to the board or source
power from the board. This input requires a regulated +3.3V voltage source.
CAUTION: Do not over drive either the J1 or BATT inputs as damage to the board may result.
VDD LED
The VDD LED indicates the state of power applied to the development board. The VDD LED
is located on the output of the OFF/ON switch. This LED will light when the board is energized
regardless of power input source.
POWER SWITCH
The OFF/ON switch connects and disconnects all input sources to the upper voltage rail. In
the OFF position, the board is unpowered and no voltage is present. In the ON position, the
input voltage source is connected to the upper voltage rail.
Figure 4: OFF/ON Switch
OFF/ON CONFIGURATION
OFF - Input power source disconnected from upper voltage rail
OFF/ON
ON - Input power source connected to upper voltage rail

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POWER SELECT
Configuration of applied input power is controlled using 2 option headers. The PWR_SEL
header selects between the on-board voltage regulator and the USB voltage input. The
VX_EN header connects J1-1 directly to the upper voltage rail. The illustrations below show
the different configuration for each option header.
PWR_SEL
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 causing the USB bus to disconnect.
CAUTION: Violating the USB specification will cause the USB bus to disconnect. This will
cause the board to reset.
The on-board voltage regulator (VR1) accepts power input through a 2.1mm barrel connector
(PWR). Input voltage may range from +5V to +15V. VR1 provides a +3.3V fixed voltage out-
put with output current limited to 800mA. Over-temperature and over-current limit built into the
voltage regulator provides limited protection from damage due to excessive stresses.
The user should consider the maximum output current of the selected power source when at-
tempting to power off-board circuitry through connector J1.
Figure 5: PWR_SEL Option Header
••• Select power input from USB-BDM
VB VDD
PWR_SEL
••• Select power input from VR1
VB VDD
PWR_SEL
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. This input requires a regulated +3.3V voltage
source. This power input is decoupled to minimize noise input but is not regulated. Also, no
protection is applied on this input and damage to the target board may result if over-driven. Do
not attempt to power the target board through this connector while also applying power through
the USB-BDM or the PWR connector as 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.

M52233DEMO SEPTEMBER 25, 2006
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Figure 6. 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 USB-BDM cable or on-board regulator
when sourcing power through connector J1 to external circuitry.
RESET
The MCF52233 can be reset several ways. A logic low applied to the RSTI* input will force the
device into RESET. This input is used by the RESET pushbutton. This input is also used to
force the device in to BDM mode. An internal low-voltage detect forces the part into RESET
when voltage falls too low.
RESET SWITCH
The RESET switch provides a method to apply an asynchronous reset to the MCU and is con-
nected directly to the RSTI* input on the MCU. Pressing the RESET switch forces RSTI* low
until the switch is released. An external pull-up on the RSTI* line prevents spurious resets and
allowing normal operation.
LOW VOLTAGE DETECT
The MCF52233 applies an internal Low Voltage Detect (LVD) to protect against under-voltage
conditions. The LVD is enabled out of RESET. Consult the MCF52235 Integrated Microcon-
troller Reference Manual for details on configuring LVD operation.
RESET INDICATOR
The RST_LED is connected to the RSTO* output on the MCF52233. This LED lights when the
MCU is in RESET and remains on for the duration of an asserted RSTO* signal. RSTO* may
also be used as a GP output to drive the RST_LED indicator as needed.

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LOW-POWER MODES
The MCF52233 supports several operational modes designed to reduce power consumption.
Low-power modes include Wait, Doze, Stop, and Halt. Refer to the MCF52235 documentation
at www.freescale.com for details on configuring and using the various low-power modes.
TIMING
Timing to the M52233DEMO clock module is provided by an external, 25 MHz crystal oscilla-
tor. Refer to the MCF52235 documentation at www.freescale.com for details on use and con-
figuration of the clock module.
COMMUNICATIONS
The M52233DEMO board provides 2 SCI ports, 1 QSPI port, and 1 IIC port. RS-232 commu-
nication is supported through a DB9 (COM) connector and through connector J1. QSPI and
IIC communications are supported only through connector J1. The COM_EN option header
enables SCI0 functionality between the MCU and the COM connector.
SCI 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
TXD0 and RXD0 are routed from the transceiver to the MCU. These signals are also available
on connector J1. Hardware flow control signals RTS0 and CTS0 are also routed from the
transceiver to the MCU. RTS is biased for correct 2-wire operation.
SCI1 signals are available on connector J1 and route directly between the MCU and connector
J1. No RS-232 logic-level translation is provided on SCI1 signals.
COM_EN
The COM_EN option header individually connects and disconnects SCI0 signals between the
MCU and the SCI transceiver. Removing a shunt disconnects the associated signal. Installing
a shunt connects the associated signal.

M52233DEMO SEPTEMBER 25, 2006
15
Table 4: COM_EN Option Header
Shunt
On Off
CTS ▪ ▪ Enabled Disabled
RTS ▪ ▪ Enabled Disabled
RXD ▪ ▪ Enabled Disabled
TXD ▪ ▪ Enabled Disabled
COM Connector
A standard 9-pin Dsub connector provides external connections for the SCI0 port. The Dsub
shell is connected to board ground through a ferrite bead. The ferrite bead provides noise
isolation on the RS-232 connection. The DB9 connector pin-out is shown below.
Figure 7: COM Connector
4, 6 1
61, 4
TXD 2
7RTS
RXD 3
8CTS
1, 6 4
9NC
GND 5
Female DB9 connector that interfaces to the ColdFire internal SCI1 serial
port via the RS232 transceiver.
Pins 1, 4, and 6 are connected together.
SPI Port
SPI signaling connects directly between connector J1 and the MCU. Refer to the MCF52235
documentation at www.freescale.com for details on using the SPI interface.
IIC Port
IIC signaling connects directly between connector J1 and the MCU. Refer to the MCF52235
documentation at www.freescale.com for details on using the IIC interface.
ETHERNET
The M52233DEMO supports ethernet physical-layer communications through an RJ-45 con-
nector at J2. This interface is compatible with IEEE 802.3 at 10/100 Mbps. This port is con-
nected to the Ethernet Physical Layer Transceiver (ePHY) and Fast Ethernet Controller (FEC)
internal to the MCU. The coupling transformer T1 provides port isolation. Refer to the
MCF52235 documentation at www.freescale.com for further details on operation of the ePHY
and FEC. Five LED’s provide ethernet port status. These active-low status LED’s are driven
directly by the MCU.

M52233DEMO SEPTEMBER 25, 2006
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Table 5: Ethernet Port Status LED’s
Indicator Color MCU Signal ePHY Status
COL Red LED_COL ON – Packet Collisions Detected
DUP Grn LED_DUP ON – Full Duplex, OFF – Half Duplex
SPD Grn LED_SPD ON – 100T, OFF – 10T
LNK Grn LED_LNK ON – Link Detected
ACT Grn LED_ACT ON – Link Active, TX or RX
NOTE: The Ethernet port must be initialized and active for status indications.
ACCELEROMETER
The M52233DEMO applies an MMA7260Q, 3-axis accelerometer for tilt and motion-sense ap-
plications. The accelerometer supports 4 user selectable sensitivities - 1.5g / 2g / 4g / 6g.
Separate (X/Y/Z) axis readings are routed to the MCU through the ACC_EN option header. A
SLEEP* input allows the device to be placed in a low-power mode.
An option header at ACC_EN allows the user to disconnect the accelerometer if necessary. In
default configurations, this option header is not installed and a cut-traces located on the bottom
of the board provide a signal path. To disconnect the accelerometer, simply open the cut-trace
and install a 1x3 pin-header at ACC_EN. Install a shunt on each signal to reconnect the ac-
celerometer. The table below shows the signal connections to the MCU.
Table 6: ACC_EN Option Header
Signal MCU Input
XAN4
YAN5
ZAN6
In default configuration, this option header is not installed. Cut-
traces on the bottom of the PCB provide signal pathways. To iso-
late these analog inputs, simply open the cut-traces and install a
2x3, 0.1” pin header.
USER OPTIONS
The M52233DEMO includes various input and output devices to aid application development.
User I/O devices include 12 pushbutton switches, 4 green LEDs, and 1 potentiometer. The
table below summarizes user option connections on the development board.

M52233DEMO SEPTEMBER 25, 2006
17
Table 7: User Option Connections
OPTION MCU PORT MCU PIN
SW1 IRQ4 57
SW2 IRQ7 58
LED1 DTIN0 22
LED2 DTIN1 23
LED3 DTIN2 18
LED4 DTIN3 19
RV1 AN0 25
Pushbutton Switches
Two push button switches provide momentary, active-low input, for user applications. Pull-ups
internal to the MCU must be enabled to provide error free switch operation. Pushbutton
switches SW1 and SW2 are connected to MCU I/O ports IRQ4* and IRQ7* respectively.
User LED’s
Four green LED’s are provided for use in application development and debug. Each LED is
configured active-high. Indicators LED1 through LED4 are enabled by the LED_EN option
header. A 3S buffer between the MCU port and the user LED’s provides the drive current
necessary to control the LED’s.
Figure 8: LED_EN Option Header
LED_EN
▪ ▪ ON User LED’s enabled active-high
LED_EN
▪ ▪ OFF User LED’s disabled
Potentiometer
A 5k ohm, single-turn, thumb-wheel type, potentiometer at RV1 provides continuous, variable
resistance input for user applications. The output is the result of a voltage divider that changes
as the thumb-wheel is turned. The potentiometer is connected between VDD and GND with
the center tap providing the divider output. This center tap is connected to the MCU on input
AN0. The potentiometer may be disconnected from AN0 by means of the POT_EN option
header.

M52233DEMO SEPTEMBER 25, 2006
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Figure 9: POT_EN Option Header
▪ ▪ ON User POT enabled
POT_EN
▪ ▪ OFF User POT disabled
POT_EN
I/O PORT CONNECTOR
Connector J1 provides access to M52233DEMO I/O signals. Signal positions not shown are
not connected (NC).
Figure 10: Connector J1
VDD 1 2 IRQ4*
GND 3 4 RSTI*
UTXD1 5 6 RSTO*
URXD1 7 8 NC
URTS1* 910 ANO
UCTS1* 11 12 AN1
GPT0 13 14 AN2
GPT1 15 16 AN3
QSPI_DOUT 17 18 AN4
QSPI_DIN 19 20 AN5
QSPI_SCLK 21 22 AN6
QSPO_CS0 23 24 AN7
UTXD0 25 26 SCL
TRXD0 27 28 SDA
URTS0* 29 30 GPT2
UCTS0* 31 32 GPT3
IRQ1* 33 34 TIN0
SYNCA 35 36 TIN1
SYNCB 37 38 TIN2
IRQ7* 39 40 TIN3