Embedded Artists LPC2478 User manual

LPC2478 Developer’s Kit - User‟s Guide
Copyright 2011 © Embedded Artists AB
EA2-USG-0801 Rev I
LPC2478 Developer’s Kit
User’s Guide
Get Up-and-Running Quickly and
Start Developing Your Applications On Day 1!

LPC2478 Developer’s Kit - User’s Guide
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Copyright 2011 © Embedded Artists AB
Embedded Artists AB
Davidshallsgatan 16
211 45 Malmö
Sweden
[e-mail]
http://www.EmbeddedArtists.com
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Embedded Artists AB.
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specifically disclaim any implied warranties or merchantability or fitness for any particular purpose.
Information in this publication is subject to change without notice and does not represent a
commitment on the part of Embedded Artists AB.
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comments to [e-mail].
Trademarks
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trademarks, or registered service marks of their respective owners and should be treated as such.

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Table of Contents
1Document Revision History 5
2Introduction 6
2.1 Features 6
2.2 ESD Precaution 7
2.3 General Handling Care 7
2.4 Code Read Protection 8
2.5 CE Assessment 8
2.6 Other Products from Embedded Artists 8
2.6.1 Design and Production Services 8
2.6.2 OEM / Education / QuickStart Boards and Kits 9
3LPC2478 OEM Board Design 10
3.1 LPC2478 OEM Board Schematics 10
3.1.1 CPU 10
3.1.2 Powering 10
3.1.3 Analog Inputs/Outputs 10
3.1.4 Ethernet Interface 10
3.1.5 External Memories 11
3.1.6 External Memory Interface 11
3.1.7 Reset Generation 11
3.1.8 I2C E2PROM 11
3.1.9 Expansion Connectors 12
3.2 Memory Layout 12
3.3 Usage of CPU Pins 12
3.4 LPC2478 OEM Board Mechanical Dimensions and Connector 13
3.5 Known Limitation of LPC2478 OEM Board 14
3.5.1 Ver 1.0 –SDRAM Clock Frequency 14
3.5.2 Ver 1.0 –Ethernet Clock 14
3.5.3 NAND FLASH Bad Block 14
3.5.4 Brand of Memory Chips 15
4QVGA Base Board Design 16
4.1 Usage of CPU Pins 16
4.2 Known Limitation of QVGA Base Board 19
4.2.1 Version 1.0/1.1 –SD/MMC Interface Pullups 19
4.3 Jumpers 20
4.3.1 Default Jumper Positions 21
4.3.2 Illegal Jumper Combinations 21
4.4 Connectors 22
4.4.1 Mictor-38 ETM Connector 22
4.5 Important Components 23
5Getting Started 24

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5.1 Demo Applications 24
5.1.1 Custom Slideshow Demo Application #3 24
5.2 Initial Setup and Powering 26
5.3 Getting Started with uClinux 28
5.3.1 Basic Requirements 28
5.3.2 LAN/Ethernet Setup 28
5.4 FTDI USB Driver Installation 30
5.4.1 USB Driver Behavior 33
6Further Information 34

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1 Document Revision History
Revision
Date
Description
A-G
2007-2010
Earlier versions of document.
H
2010-12-10
Updated manual according to new template. Removed schematics
from document. Added known issue with newer SD/MMC memory
cards (requiring pull-up resistors).
I
2011-12-19
Added note about CE marking.

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2 Introduction
Thank you for buying Embedded Artists‟ LPC2478 Developer’s Kit based on NXP‟s ARM7TDMI-S
LPC2478 microcontroller.
This document is a User‟s Guide that describes the LPC2478 OEM Board (both 16- and 32-bit data
bus versions) and the QVGA Base Board hardware design. It is the User‟s Manual for both the
LPC2478 Developer’s Kit as well as for just the LPC2478 OEM Board. There is a separate document
describing program development for the LPC2xxx series in general with Embedded Artists QuickStart
Build Environment.
2.1 Features
Embedded Artists‟LPC2478 OEM Board with NXP‟s ARM7TDMI-S LPC2478 microcontroller lets you
get up-and-running quickly. The small form factor OEM board offers many unique features that ease
your learning curve and program development. The board has also been designed for OEM
applications with volume discount available.
NXP's ARM7TDMI LPC2478 microcontroller in BGA package, with 512 KByte program
FLASH and 96 KByte SRAM
External FLASH memories: 128 MB NAND FLASH and 4 MB NOR FLASH
External data memory: 32 MB SDRAM (32-bit or 16-bit databus width)
12.0000 MHz crystal for maximum execution speed and standard serial bit rates, including
CAN and USB requirements
32.768kHz RTC crystal
100/10M Ethernet PHY/interface based on National DP83848
256 Kbit I2C E2PROM for storing non-volatile parameters
Buffered 16- or 32-bit data bus for external expansion
200 pos expansion connector (SODIMM-200 format, 0.6mm pitch)
All LPC2478 pins available (except a few used for Ethernet-PHY interface)
+3.3V only powering
Onboard reset generation
Compact SODIMM format: 66 x 48 mm
Six layer PCB design for best noise immunity
There is an accompanying QVGA Base Board that can be used for initial prototyping work. The
features of the board are:
3.2 inch QVGA TFT color LCD with touch screen (4-wire version)
18-bit RGB interface to display
Connectors
200 pos, 0.6mm pitch SODIMM connector for LPC2478 OEM Board
Expansion connector with all LCD controller signals, for custom displays
Expansion connector with all cpu signals
Ethernet connector (RJ45)

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CAN interface & connector
MMC/SD interface & connector
JTAG connector
Pads for ETM connector
Interfaces
USB OTG interface & connector
USB host interface & connector
Full modem RS232 on UART #1 (cannot be used on 32-bit databus cpu boards, but
RxD2/TxD2 can alternatively be connected to the RS232 interface)
Dual CAN interface & connector
IrDA transceiver interface
Power
Power supply, either via USB or external 9-15V DC
0.3F capacitor backup power for RTC and LED on ALARM output on LPC2478
Other
5-key joystick
3-axis accelerometer
5 push-button keys (four via I2C and one on P2.10)
9 LEDs (8 via I2C and one on P2.10)
Analog input
USB-to-serial bridge on UART #0 (FT232R) and ISP functionality
Reset push-button and LED
Speaker output on DAC output from LPC2478
250x150 mm in size
2.2 ESD Precaution
Please note that the LPC2478 OEM Board and QVGA Base Board come without
any case/box and all components are exposed for finger touches –and therefore
extra attention must be paid to ESD (electrostatic discharge) precaution.
Make it a habit always to first touch the metal surface of one of the USB or
Ethernet connectors for a few seconds with both hands before touching
any other parts of the boards. That way, you will have the same potential as
the board and therefore minimize the risk for ESD.
Never touch directly on the LPC2478 OEM Board and in general as little as possible on the QVGA
Base Board. The push-buttons on the QVGA Base Board have grounded shields to minimize the effect
of ESD.
Note that Embedded Artists does not replace boards that have been damaged by ESD.
2.3 General Handling Care
Handle the LPC2478 OEM Board and QVGA Base Board with care. The boards are not mounted in a
protective case/box and are not designed for rough physical handling. Connectors can ware out after

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excessive use. The QVGA Base Board is designed for prototyping use, and not for integration into an
end-product.
Do not exercise excessive pressure on the LCD glass area. That will damage the display. Also, do not
apply pressure on the flex cables connecting the LCD/touch screen. These are relatively sensitive and
can be damaged if too much pressure is applied to them.
Note that Embedded Artists does not replace boards where the LCD has been improperly
handled.
2.4 Code Read Protection
The LPC2478 has a Code Read Protection function (specifically CRP3) that, if enabled, will make the
LPC2478 impossible to reprogram (unless the user program has implemented such functionality).
Note that Embedded Artists does not replace LPC2478 OEM boards where the LPC2478 has
CRP3 enabled. It’s the user’s responsibility to not invoke this mode by accident.
2.5 CE Assessment
The LPC2478 Developers Kit (consisting of the LPC2478 OEM Board and QVGA Base Board) is CE
marked. See separate CE Declaration of Conformity document.
The LPC2478 Developers Kit is a class A product. In a domestic environment this product may cause
radio interference in which case the user may be required to take adequate measures.
EMC emission test has been performed on the LPC2478 Developers Kit. Standard interfaces like
Ethernet, USB, serial have been in use. General expansion connectors where internal signals are
made available (for example processor pins) have been left unconnected. Connecting other devices to
the product via the general expansion connectors may alter EMC emission. It is the user‟s
responsibility to make sure EMC emission limits are not exceeded when connecting other devices to
the general expansion connectors of the LPC2478 Developers Kit.
Due to the nature of the LPC2478 Developers Kit –an evaluation board not for integration into an end-
product –fast transient immunity tests and conducted radio-frequency immunity tests have not been
executed. Externally connected cables are assumed to be less than 3 meters. The general expansion
connectors where internal signals are made available do not have any other ESD protection than from
the chip themselves. Observe ESD precaution.
Note that the LPC2478 OEM board is classified as a component and is hence not CE marked
separately. It can perform different functions in different integrations and it does not have a direct
function. It is therefore not in the scope of the CE Directive. An end product, where an OEM Board is
integration into, is however very likely to need CE marking.
2.6 Other Products from Embedded Artists
Embedded Artists have a broad range of LPC1000/2000/3000/4000 based boards that are very low
cost and developed for prototyping / development as well as for OEM applications. Modifications for
OEM applications can be done easily, even for modest production volumes. Contact Embedded Artists
for further information about design and production services.
2.6.1 Design and Production Services
Embedded Artists provide design services for custom designs, either completely new or modification to
existing boards. Specific peripherals and I/O can be added easily to different designs, for example,
communication interfaces, specific analog or digital I/O, and power supplies. Embedded Artists has a
broad, and long, experience in designing industrial electronics in general and with NXP‟s
LPC1000/2000/3000/4000 microcontroller families in specific. Our competence also includes wireless
and wired communication for embedded systems. For example IEEE802.11b/g (WLAN), Bluetooth™,
ZigBee™, ISM RF, Ethernet, CAN, RS485, and Fieldbuses.

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2.6.2 OEM / Education / QuickStart Boards and Kits
Visit Embedded Artists‟ home page, www.EmbeddedArtists.com, for information about other OEM /
Education / QuickStart boards / kits or contact your local distributor.

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3 LPC2478 OEM Board Design
This chapter contains information about the LPC2478 OEM Board design, both 32-bit and 16-bit
databus width. The schematic can be downloaded in pdf from the support page, and is recommended
to have printed out while reading this chapter.
3.1 LPC2478 OEM Board Schematics
3.1.1 CPU
The core part of the design is the NXP LPC2478 microcontroller. It‟s an ARM7TDMI-S CPU core with a
lot of different peripheral units and on-chip memory (512 KByte FLASH and 96 KByte SRAM). There is
also an external memory bus interface. Page 2 of the schematic contains the CPU section of the
design.
The microcontroller crystal frequency is 12.0000 MHz. This frequency has been selected in order to
allow high execution speed (the PLL can generate a 72 MHz core clock from this) as well as
generating standard clock frequencies for the CAN and USB interfaces. The on-chip UART peripheral
includes a fractional baud rate generator that allows standard baud rates to be generated with low
frequency error.
There is a 32.768 kHz crystal clock for the on-chip real-time clock peripheral unit or RTC for short. The
microcontroller can be placed in a very low power mode while the RTC operates and keeps track of
time. Power for the RTC (during these low power modes) comes from the VBAT input pin. Power is
sourced either from the +3.3V power supply or the external VBAT_IN signal (available on the
expansion connector), depending on which one have highest voltage.
3.1.2 Powering
There is no internal power supply on the board. The LPC2478 contains an internal DC/DC converter to
generate the internal 1.8V power needed by the core. The LPC2478 OEM Board module must be
powered by a single, external +3.3V power supply. The supply must be stable and should have at least
four 22uF bulk capacitor(s) close to the power pins on the expansion connectors.
3.1.3 Analog Inputs/Outputs
The LPC2478 contains analog peripherals that need a reference voltage, which is supplied from the
VREF input pin. This reference voltage must be supplied externally can be the VDDA power (which is
a filtered +3.3V power supply). The VDDA power is available on the expansion connector under the
name V3A. See schematic for details. A filtered version of analog ground is also available under the
name VSSA.
3.1.4 Ethernet Interface
The LPC2478 have an internal Ethernet MAC peripheral with interface to an external PHY (i.e., the
analog interface to an Ethernet interface). Page 2 of the schematic contains the Ethernet PHY. The
DP83848 external Ethernet PHY from National is used and interfaces the LPC2478 via the RMII
interface.
The PHY is driven by an external 50 MHz clock that is also feed to the LPC2478. This is part of the
RMII interface specification.
The PHY is always enables (can be disabled under program control) but have an external „power
down‟ signal that can be used by an external device. There is also an interrupt signal from the PHY
that can be used to signal link events (like connect/disconnect of a cable). Neither the power down nor
the interrupt signal is used by the LPC2478 OEM Board but the signals are available on the expansion
connector. If the signals are not used, just leave them unconnected.

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3.1.5 External Memories
There are three external memory chips connected to the external memory bus interface of the
LPC2478. Both 32-bit and 16-bit databus width versions of the board exist.
An external NOR FLASH (32 MBit = 4 MByte in size) addressed by CS0 (address range:
0x8000 0000 –0x80FF FFFF). Accessed via 16-bit databus.
An external NAND FLASH (1 GBit = 128 MByte in size) addressed by CS1 (address range:
0x8100 0000 –0x81FF FFFF). Accessed via 8-bit databus.
An external SDRAM (256 MBit = 32 MByte in size) addressed by DYCS0 (address range:
0xA000 0000 –0xAFFF FFFF). Accessed via 32-bit or 16-bit databus, dependent on board
version.
The NAND FLASH has an optional busy output that can be used for controlling the erase/program
operations with better precision. The signal is available on the expansion connector. If needed the
signal can be routed to a suitable (i.e., free) input pin. The busy status of the chip is also available
under software control.
3.1.6 External Memory Interface
The LPC2478 memory interface is available on the expansion connector. The data bus width is either
16- or 32-bits on the external interface (depending on board version). All signals are buffered. The
buffers are disabled unless enabled by external signals.
By pulling signal ABUF_EN low, the two buffers for address and control signals are enabled and act as
outputs (from the LPC2478 OEM Board).
The data bus buffer is controlled by the signal DBUS_EN. By pulling this signal low, the data bus buffer
is enabled. The LPC2478 signal OE controls the direction of the data bus buffer. During read
operations the buffer acts as an input and during write operations it acts as an output.
Note that DBUS_EN must not be pulled low constantly. In that case the buffer will collide with the
board‟s internal data bus. DBUS_EN must only be pulled low when an external memory/IO device is
accessed. If, for example, CS2 is used to decode and access an external device, connect the signal
CS2 directly to DBUS_EN.
If more than one chip select signal is used, (logically) AND all chip select signal together before driving
the DBUS_EN signal.
If the external memory interface is not used, leave ABUS_EN and DBUS_EN unconnected.
3.1.7 Reset Generation
The rest generation is handled by a standard voltage supervisor chip, CAT811S from Catalyst
Semiconductor. The reset signal will be held active (i.e., low) until the supply voltages, +3.3V, is within
margins. The reset duration is typically 200 mS (consult the CAT811S datasheet for exact details). The
output reset signal is push/pull output that is converted to an open-collector / open-drain output via the
74LVC1G125 buffer. An external reset source can pull the reset signal low (with an open-
collector/open-drain output).
The reset generator can be found on page 2 of the schematic.
3.1.8 I2C E2PROM
There is also a 256 kbit E2PROM accessible via the I2C interface. The LPC2478 microcontroller has
three on-chip I2C communication channels. Channel #0 is used for communicating with the E2PROM.
More peripheral units are easily connected to the two-wire I2C bus, just as long as the addresses do
not collide. The address of the 256kbit E2PROM is 0xA0.
There are 1.5 kohm pull-up resistors (which are always needed on I2C busses) included on the board.
The I2C E2PROM can be found on page 2 of the schematic.

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3.1.9 Expansion Connectors
The LPC2478 OEM Board integrated the core part of a typical LPC2478 board design with a
reasonable large amount of external memories. Almost all signals of LPC2478 are available on the 200
pos, 0.6mm pitch expansion connector (SODIMM-200 format).
3.2 Memory Layout
The external memory controller on the LPC2478 defines eight memory regions, named: CS0, CS1,
CS2, CS3, DYCS0, DYCS1, DYCS2, and DYCS3. Of these eight, three memory areas are used by the
LPC2478 OEM Board. These are:
CS0 (address range: 0x8000 0000 –0x80FF FFFF)
An external NOR FLASH (32 MBit = 4 MByte in size) is addressed.
CS1 (address range: 0x8100 0000 –0x81FF FFFF)
An external NAND FLASH (1 GBit = 128 MByte in size) is addressed.
DYCS0 (address range: 0xA000 0000 –0xAFFF FFFF)
An external SDRAM (256 MBit = 32 MByte in size) is addressed.
These three memory regions cannot be used by external devices. CS2 and DYCS1 are however free
for external use via the buffered memory interface. Both address and data busses are buffered.
3.3 Usage of CPU Pins
Almost all pins of the LPC2478 are directly available on the expansion connectors. Only in a few cases
are pins used for dedicated functionality like Ethernet interface and chip select signals. Such pins are
not available on the expansion connector. The table below lists all pins and their possible restrictions.
Pin
Available on expansion
connector
P0.0-P0.26
Yes
P0.27- P0.28
Yes, but I2C E2PROM
connected to these pins.
P0.29-P0.31
Yes
USBB-
Yes
P1.0-P1.1,
P1.4,
P1.8-P1.10,
P1.14-P1.17
No, connected to Ethernet
PHY
P1.2-P1.3,
P1.5-P1.7,
P1.11-P1.13,
P1.18- P1.26-
P1.31
Yes
P2.0-P2.15,
P2.19,
P2.21-P2.23,
P2.25-P2.27
Yes
P2.16-P2.17
Yes, but used as RAS/CAS
and only available as outputs
via a buffer
P2.18,
P2.20,
P2.24
No, used as
CLKOUT0/DYCS0/CKE0 for
external SDRAM
P2.28-P2.29
Yes, but used as
DQM0/DQM1 (for external
SDRAM) and only available
as outputs via a buffer
P2.30-P2.31
Yes, but used as
DQM2/DQM3 (on 32-bit data
bus version)
P3.0-P3.15
Yes, but used as data bus
and only available via data
bus buffer
P3.16-P3.31
Yes. On 32-bit data bus
versions these pins are used
for upper 16 bits of the data
bus and are only available
via the data bus buffer
P4.0-P4.23
Yes, but used as address
bus and only available as
outputs via buffers
P4.24-P4.27
Yes, but used as

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OE/WE/BLS0/BLS1 and only
available as outputs via a
buffer
P4.28-P4.29
Yes
P4.30-P4.31
No, used as CS0/CS1 for
external NOR/NAND FLASH
memories
VBAT
Yes, via forward diode
ALARM
Yes
VREF
Yes. Note that VDDA is
VDDA,
VSSA
connected to +3.3V power
supply
X1-X2,
RTCX1-
RTCX2
No, directly connected to on-
board crystals
JTAG signals
Yes
RESET,
RSTOUT
Yes
The QVGA Base Board illustrates how to typically connect external interfaces (like Ethernet, USB,
external memory devices, etc) to the LPC2478 OEM Board. Study this schematic (also found in this
document) for details.
3.4 LPC2478 OEM Board Mechanical Dimensions and Connector
Figure 1 below contains a drawing of the board that includes mechanical measures. See SODIMM-200
standard for exact measures. 1.8V keying is used (SODIMM-200 boards are either 1.8V or 2.5V
keyed).
Figure 1 - LPC2478 OEM Board Mechanical Dimensions, 32-bit databus version shown
The SODIMM-200 format is a standard and there exist many connectors that are suitable form many
different manufactures. The many sources also keep the connector cost very low. Note that the
connector should be 1.8V keyed.
66 mm
48 mm
1.8V keying of SODIMM board
This is how the 32-bit
databus versions look
like

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One suitable connector is 0-1473005-4 from Tyco/AMP. Basically any SODIMM, DDR2, 200pos, 1.8V,
right angled connector will do.
3.5 Known Limitation of LPC2478 OEM Board
3.5.1 Ver 1.0 –SDRAM Clock Frequency
There is one known limitation of the LPC2478 OEM Board. The cpu core clock frequency must not
exceed 48 MHz when using the external SDRAM. This limitation only applies to v1.0 boards with 32-bit
external databus width. Boards with 16-bit databus can run at full speed. On v1.0 of 16-bit boards there
is a small modification on the boards. On all v1.1 boards (16- and 32-bit) this limitation is fixed in the
design, i.e., the boards can run at full 72MHz.
Normally the internal PLL frequency is set to 288 MHz (the external 12 MHz crystal frequency
multiplied by 24). Dividing 288 MHz with 6 gives a core frequency of 48 MHz and dividing with 4 gives
72 MHz.
The limitation results in a maximum cpu clock frequency of 48 MHz when using the external SDRAM. If
the SDRAM is not used, the cpu core frequency can be up to full specification of the LPC2478.
3.5.2 Ver 1.0 –Ethernet Clock
Due to an error in clock routing between the Ethernet PHY and the LPC2478, rev 1.0 boards have
been modified slightly. The error is also temperature dependent. Only a small number of ver 1.0
boards have been shipped without this modification and these boards were tested not to have any
problems. The picture below illustrates the modification made.
The problem is fixed on ver 1.1 boards.
Figure 2 - LPC2478 OEM Board Ethernet Clock Modification
3.5.3 NAND FLASH Bad Block
The NAND Flash is the K9F1G08U0A from Samsung and contains 1G bit with a spare 32M bit
capacity. The chip may include invalid blocks when shipped from factory. A maximum of 20 invalid
blocks may exist initially, i.e., 1004-1024 valid blocks. Additional invalid blocks may develop while
1) Pin 25 of the Ethernet PHY has been lifted
and removed.
2) A short wire has been soldered to the 50
MHz oscillator output.
3) The wire is soldered in the other end to
the pad of the removed Ethernet PHY pin.

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being used. Invalid blocks are defined as blocks that contain one or more bad bits. Do not erase or
program factory-marked bad blocks. Refer to technical notes from Samsung for appropriate
management of invalid blocks.
3.5.4 Brand of Memory Chips
Note that there is no guarantee for a certain brand or version of memory chips; NOR flash, NAND flash
and SDRAM. The lifetime of memory chips is limited and availability can also be limited from time to
time. Embedded Artists make every effort to mount the original design chip on the board. In case that
is impossible a compatible chip will instead be mounted without any prior notice. There can be small
programming differences between mounted brands. The application program shall always read the
chip id of flash devices to make certain which chip is actually mounted on the board.
The support page contains datasheets to the different memory devices and information about mounted
devices on different board versions.

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4 QVGA Base Board Design
This chapter contains information about the peripherals and general design of the QVGA Base Board
and how to set the different jumpers on the board. The schematic can be downloaded in pdf from the
support page, and is recommended to have printed out while reading this chapter.
The QVGA Base Board contains a number interfaces and connectors to the LPC2478 OEM Board.
The design can be viewed as a reference schematic for custom designs around the LPC2478 OEM
Board.
4.1 Usage of CPU Pins
Almost all pins of the LPC2478 are directly available on the expansion connectors. Only in a few cases
are pins used for dedicated functionality like Ethernet interface and chip select signals. Such pins are
not available on the expansion connector. The table below lists all pins and their possible restrictions.
Pin
Usage
P0.0
Can be connected to RD1 for CAN channel #1, can also connect to IrDA
transceiver
P0.1
Can be connected to TD1 for CAN channel #1, can also connect to IrDA
transceiver
P0.2
Can be connected to USB-to-serial bridge (TxD on UART #0)
P0.3
Can be connected to USB-to-serial bridge (RxD on UART #0)
P0.4
LCD databit 0, can also be connected to RD2 for CAN channel #2
P0.5
LCD databit 1, can also be connected to TD2 for CAN channel #2
P0.6
LCD databit 8
P0.7
LCD databit 9
P0.8
LCD databit 16
P0.9
LCD databit 17
P0.10
Can be connected to RS232 interface (TxD on UART #2)
P0.11
Can be connected to RS232 interface (RxD on UART #2)
P0.12
Can be connected to enable USB-host power switch
P0.13
Can be connected to LED (active low) for USB-host indicator
P0.14
Can be connected to USB-device enable-device signal
P0.15
QVGA display and Touch screen serial interface (SPI-SCK)
P0.16
QVGA display serial interface (SSEL)
P0.17
QVGA display and Touch screen serial interface (SPI-MISO)
P0.18
QVGA display and Touch screen serial interface (SPI-MOSI)
P0.19
QVGA display serial interface (command/data select)
P0.20
Touch screen serial interface (SSEL)
P0.21
No special usage on QVGA Base Board
P0.22
No special usage on QVGA Base Board
P0.23
Can be connected to accelerometer, X-axis

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P0.24
Can be connected to accelerometer, Y-axis
P0.25
Can be connected to accelerometer, Z-axis, or analog input (trimpot)
P0.26
Connects to speaker output on AOUT signal
P0.27
I2C-SDA0, connects to PCA9532 (IO expander)
P0.28
I2C-SCL0, connects to PCA9532 (IO expander)
P0.29-P0.30
Connects to USB device/OTG interface
P0.31,
USBB-
Connects to USB host interface
P1.2
Connects to MCICLK on SD/MMC connector
P1.3
Connects to MCICMD on SD/MMC connector
P1.5
Connects to MCIPWR on SD/MMC connector
P1.6
Connects to MCIDAT0 on SD/MMC connector
P1.7
Connects to MCIDAT1 on SD/MMC connector
P1.11
Connects to MCIDAT2 on SD/MMC connector
P1.12
Connects to MCIDAT3 on SD/MMC connector
P1.13
No special usage on QVGA Base Board
P1.18
Connects to QVGA backlight control. Can also be connected to LED (active low) to
be used for USB device/OTG
P1.19
No special usage on QVGA Base Board
P1.20
LCD databit 10
P1.21
LCD databit 11
P1.22
LCD databit 12
P1.23
LCD databit 13
P1.24
LCD databit 14
P1.25
LCD databit 15
P1.26
LCD databit 20
P1.27
LCD databit 21, can also be connected to ISP1301 (USB OTG transceiver)
P1.28
LCD databit 22, can also be connected to ISP1301 (USB OTG transceiver)
P1.29
LCD databit 23, can also be connected to ISP1301 (USB OTG transceiver)
P1.30
Can be connected to VBUS signal from USB host power
P1.31
Can be connected to over-current error signal from USB host power switch
P2.0
LCDPWR signal, power enable for QVGA display. Also connects to ETM pads, if
connector mounted.
P2.1
LCDLE signal. Not used by design. Also connects to ETM pads, if connector
mounted.
P2.2
LCDDCLK signal, dot clock for QVGA display. Also connects to ETM pads, if
connector mounted.

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P2.3
LCDFP signal, vsync for QVGA display. Also connects to ETM pads, if connector
mounted.
P2.4
LCDENAB signal, data enable for QVGA display. Also connects to ETM pads, if
connector mounted.
P2.5
LCDLP signal, hsync for QVGA display. Also connects to ETM pads, if connector
mounted.
P2.6
LCD databit 4. Also connects to ETM pads, if connector mounted.
P2.7
LCD databit 5. Also connects to ETM pads, if connector mounted.
P2.8
LCD databit 6. Also connects to ETM pads, if connector mounted.
P2.9
LCD databit 7. Also connects to ETM pads, if connector mounted.
P2.10
Connected to push-button (for enabling bootloader during reset or EINT0 input).
Also connects to LED (active low).
Connects to USB-to-serial bridge (for automatic ISP functionality)
P2.11
LCDCLKIN, an external clock signal can be feed to this pin.
P2.12
LCD databit 18
P2.13
LCD databit 19
P2.14
Can connect as enable signal for IrDA transceiver (active low)
P2.15
Can connect to interrupt signal from touch screen controller
P2.19
Can be connected to Ethernet PHY interrupt output
P2.21
Can be connected to NAND FLASH busy output
P2.22
Connects to joystick switch
P2.23
Connects to joystick switch
P2.25
Connects to joystick switch
P2.26
Connects to joystick switch
P2.27
Connects to joystick switch
P2.30
Can control sensitivity of accelerometer (cannot be used on 32-bit databus
versions)
P2.31
Can control sensitivity of accelerometer (cannot be used on 32-bit databus
versions)
P3.0-P3.15
Occupied for 16-bit databus versions. No special usage on QVGA Base Board
P3.16-P3.31
Also occupied for 32-bit databus versions, No special usage on QVGA Base Board
P3.16
Can be connected to RS232 interface (if 16-bit databus version used)
P3.17
Can be connected to RS232 interface (if 16-bit databus version used)
P3.18
Can be connected to RS232 interface (if 16-bit databus version used)
P3.19
Can be connected to RS232 interface (if 16-bit databus version used)
P3.20
Can be connected to RS232 interface (if 16-bit databus version used)
P3.21
Can be connected to RS232 interface (if 16-bit databus version used)

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P3.22
Can be connected to RS232 interface (if 16-bit databus version used)
P3.23
No special usage on QVGA Base Board (if 16-bit databus version used)
P3.24
No special usage on QVGA Base Board (if 16-bit databus version used)
P3.25
No special usage on QVGA Base Board (if 16-bit databus version used)
P3.26
No special usage on QVGA Base Board (if 16-bit databus version used)
P3.27
No special usage on QVGA Base Board (if 16-bit databus version used)
P3.28
No special usage on QVGA Base Board (if 16-bit databus version used)
P3.29
No special usage on QVGA Base Board (if 16-bit databus version used)
P3.30
Can be connected to RS232 interface (if 16-bit databus version used)
P3.31
No special usage on QVGA Base Board (if 16-bit databus version used)
P4.0-P4.23
The address bus, buffered signals from cpu board. No special usage on QVGA
Base Board.
P4.24
OE, buffered signal from cpu board. No special usage on QVGA Base Board.
P4.25
WE, buffered signal from cpu board. No special usage on QVGA Base Board
P4.26
BLS0, buffered signal from cpu board. No special usage on QVGA Base Board
P4.27
BLS1, buffered signal from cpu board. No special usage on QVGA Base Board
P4.28
LCD databit 2
P4.29
LCD databit 3
VBAT
0.33F backup cap on vbat signal
ALARM
Connected to alarm-LED (active high)
VREF
Can be connected VDDA(V3A)
VDDA,
VSSA
Used to generate reference voltage for trimpot (analog inputs)
JTAG signals
Connected to standard 20 pos (2x10 pin) JTAG connector
„JTAG Enable‟ jumper also exists
RESET
Connects to RESET push-button and USB-to-serial bridge (for automatic ISP
functionality)
RSTOUT
Connects to RESET LED indicator.
Used to reset PCA9532 and QVGA display.
4.2 Known Limitation of QVGA Base Board
4.2.1 Version 1.0/1.1 –SD/MMC Interface Pullups
Newer SD/MMC memory cards require pull-ups (10-100Kohm) on the five data and command signals.
Version 1.2 of the QVGA Base Board has these five pull-up resistors, but version 1.0 and version 1.1
do not. In case of problems with the interface, it is recommended to add pull-up resistors. See version
1.2 schematic for details.

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4.3 Jumpers
The QVGA Base Board has a number of jumpers in order to be able to connect/disconnect and fully
utilize all functionality of the LPC2478 and the boards. Figure 3 illustrates all jumpers and explains to
what part of the design they belong.
Figure 3 –QVGA Base Board Jumpers
USB OTG/device
J25
Connect or
disconnect ISP1301
signals
USB device connect
J37
Top pos: always enable
Lower pos: enable via
P0.14
UART#0 and
ISP Functionality
J14, in order from
top to bottom:
TxD0
RxD0
P2.10
RESET
Analog Input
J11
Connect V3A
to VREF and
trimpot to
analog AD0.2
Accelerometer
J12
Connect xyz to
AD0.0-AD0.2
Enable ETM
J10
No of disp. colors
J30/J31/J32
All to left: 16-bit
color interface to
display
All to right: 24-bit
color interface
Enable JTAG
J6
NAND Busy and
Ethernet PHY
J7
Top: Connect Nand busy
signal to P2.2
Bottom: Connect
Ethernet PHY PD–signal
to P2.19
LCD Enable
J33
Enable power
switch to
display
Int/ext
display
J34/J35
Select
internal or
external
display (for
SPI bus and
interrupt)
RS232 UART
J20/J23/J24
Connect RS232
interface to UART #1 or
RxD/TxD on UART #2
USB host
J27
Connect or
disconnect signals
IrDA
Shutdown
J22
CAN/IrDA
J18/J19
Connect
either CAN
or IrDA to
P0.0-P0.1
CAN/IrDA
J16
Connect
P0.4-P0.5 to
CAN
Backlight Shutdown
J29
Inserted: Shutdown
backlight
Open: Enable
backlight control