Freescale Semiconductor MCF51CN128 User manual

TCP/IP Applications Using the
MCF51CNFamily—Designer Reference
Manual
Device Supported: MCF51CN Microcontrollers
Document Number: DRM114
Rev. 0, 12/2009

TCP/IP Applications Using the MCF51CN Family—Designer Reference Manual, Rev. 0, 12/2009
Freescale Semiconductor2

Contents
PageTitleSection Number
Chapter 1
Introduction
Overview...........................................................................................................................................................................51.1
Key Features.....................................................................................................................................................................51.2
Advantages........................................................................................................................................................................81.3
Development Tools...........................................................................................................................................................81.4
Top and Bottom View of the MCF51CN128 Reference Design Hardware......................................................................81.5
How the MCF51CN128 Reference Design FitsYour System..........................................................................................91.6
Chapter 2
Hardware Description
Hardware.........................................................................................................................................................................132.1
Minimal System Features...............................................................................................................................................132.2
Demo System Features...................................................................................................................................................142.3
Connection Between Minimal System and Demo System Features...............................................................................152.4
Hardware Block Diagram...............................................................................................................................................162.5
Pinout Description..........................................................................................................................................................182.6
MCF51CN128 Reference Design Board Power Options...............................................................................................192.7
Hardware Considerations................................................................................................................................................202.8
Chapter 3
Firmware Description
Firmware.........................................................................................................................................................................213.1
Firmware Organization...................................................................................................................................................213.2
Block Diagram................................................................................................................................................................223.3
System Startup................................................................................................................................................................233.4
Internal Functionality of Socket Layer...........................................................................................................................243.5
Chapter 4
System Setup
Getting Started................................................................................................................................................................274.1
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PageTitleSection Number
Install Software...............................................................................................................................................................274.2
Hardware Setup...............................................................................................................................................................274.3
HTTP Server Functionality.........................................................................................................................284.3.1
Email Client Functionality..........................................................................................................................314.3.2
FTP Server Functionality.............................................................................................................................324.3.3
Serial Bridge Functionality..........................................................................................................................344.3.4
Principle of Operation.....................................................................................................................................................354.4
Serial Configuration Commands....................................................................................................................................364.5
Support............................................................................................................................................................................394.6
Appendix A
Additional Files...............................................................................................................................................................41A.1
Appendix B
Bill of Materials (BOM).................................................................................................................................................43B.1
Appendix C
Schematics......................................................................................................................................................................47C.1
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Chapter 1
Introduction
1.1 Overview
This reference manual describes using the MCF51CN128 reference design hardware
to run the following TCP/IP applications:
•SCI/SPI to Ethernet
•Web Server
•Email Client
•FTP Server
All hardware schematics diagram, gerber files,Allegro hardware source files, board pictures,
and firmware source codes are available in reference materials.All hardware files and
software can be reused to enable directly TCP/IP connectivity in customized applications.
For details about the technical implementation of the reference design main features, refer
to the following documents:
•Application note titled Serial-to-Ethernet Bridge Using MCF51CN Family and
FreeRTOS (document AN3906)
•Application note titled Web Server Using MCF51CN Family and FreeRTOS (document
AN3928)
•Application note titled Email Client Using MCF51CN Family and FreeRTOS (document
AN3930)
•Application note titled FTP Server Using MCF51CN Family and FreeRTOS (document
AN3931)
1.2 Key Features
•Uses Freescale ColdFire V1 Core MCF51CN128 48-pin QFN package running up
to 50.33 MHz
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•Low cost board in a minimal size of 2.89’’× 1.55’’. Ethernet Minimal System is 1.15’’
× 1.55’’.
•For the MCF51CN128 reference design hardware, power can be applied to both unused
pairs from the RJ45 cable. Therefore, power through the jack is not required. For more
details go to Section 2.7.
•The following TCP/IP services are implemented.
DHCP Client Service:•IP dynamic address (DHCP) or static support at runtime•
•Serial Bridge
A UART or SPI to Ethernet bridge is implemented using the socket approach.•
•Supports client or server implementation that allows connecting two serial
bridges using the Internet.
•An always enabled web page can configure all interfaces and bridge settings.
A reset command can be sent through the web page to make settings take effect.
•The following settings can be changed or shown at runtime through the
configuration web page or at compile time:
•MAC address
•IP address
•IP mask address
•IP gateway address
•Server address to connect as a client
•Static or dynamic IP address
•TCP port to connect or bind to
•TCP client or server implementation
•Configuration or bridge implementation
•UART port
•UART baudrate
•UART parity
•UART number of bits
•UART number of stop bits
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Key Features

•UART flow control
•SPI port
•SPI baudrate
•SPI polarity
•SPI phase
•SPI master or slave
•SPI polling or interrupt handling
•Using hardware and software flow control for the RS232 interface
•Presence of RS485 transceiver and connector
•The bridge can be configured through the UART interface using a set of
commands explained in Section 4.5
•For the MCF51CN128 reference design hardware, power can be applied to pin
6 of the UART connector. Therefore, the power jack is not required. Refer to
Figure 2-5 for more details.
•An accelerometer by SPI is on-board to test SPI bridge.
•HTTP Server Service
•Supports HTTP with the following services:
•HTTP 2.0—Persistent connections or keep-alive sessions
•SSI—Server side include (SSI) directives
•AJAX—Used to give the illusion that a web page changes without
refreshing it
•FORMS (POST request)
•CGI—(POST request) common gateway interface support
•Tasks status though a web page
•Email Client Service
•Assigned IP is sent via email if the dynamic IP is used.
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Chapter 1 Introduction

•FTP Server Service
•Stores information using FAT and then makes it accessible using FTP
•FTP is mounted over an SD card reader
1.3 Advantages
•The MCF51CN128 is a low cost MCU that can enable Ethernet/TCP/IP connectivity
to any embedded design.
•Software source codes are available to directly use in a customer application. It also
allows customer changes or customizations.
•Hardware files are provided for free. If a change in hardware is required for a customized
design, hardware source files can be edited.
•The MCF51CN128 MCU can obtain power from connectors like the RJ45 and DB9.
•For support enter a service request at, www.freescale.com/support.
1.4 DevelopmentTools
•CodeWarrior V6.2.1 is used to download the software application.
•A proper Ethernet cable must be selected depending on the Ethernet element that is the
PC, hub, switch, or router.
1.5 Top and BottomView of the MCF51CN128 Reference Design
Hardware
The following figures describe the top and bottom view of the board. A hardware block
diagram is shown in Figure 2-2. For details about components, go to Sections 2.2 and Section
2.3.
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Advantages

Figure 1-1.Top view of MCF51CN128 reference design hardware
Figure 1-2. Bottom view of MCF51CN128 reference design hardware
1.6 How the MCF51CN128 Reference Design FitsYour System
The following figures show how the system fits into some TPC/IP applications. Specific
features are explained in the Section Firmware. The figures show reference design squared
by a red box.
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Chapter 1 Introduction

Figure 1-3. Serial bridge in Bridge mode
Figure 1-4. Serial bridge in Configuration mode
Figure 1-5.Web server implemented at MCF51CN family providing HTTP services, one
client at a time
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How the MCF51CN128 Reference Design FitsYour System

Figure 1-6. Email client connecting to an SMTP server
Figure 1-7. FTP server using FAT16 on an SD card
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Chapter 1 Introduction

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How the MCF51CN128 Reference Design FitsYour System

Chapter 2
Hardware Description
2.1 Hardware
The hardware design characteristics are as follows:
1. Show the small-size Ethernet application board using the MCF51CN128 MCU—This
area must be programmable, functional, and completely independent.This area is called
the Minimal System (see Section 2.4).
2. Demonstrate the Minimal System capabilities using sensors and external hardware.
This area is called the Demo System (see Section 2.4).
3. The Minimal System must be designed in the hardware in such a way that the whole
system can work independent of the Demo System.A set of zero—Resistors are provided
so the Minimal System can be isolated from the Demo System.
4. Provide the user with customizable hardware—If only the Minimal System is required,
layout files from the MCF51CN128 reference design can be edited. Therefore, the
Minimal System can be copied to a new hardware project. Only a power source
connection is required for the Minimal System.
5. To reuse the Minimal System, the same hardware components must be selected.
6. The Demo System must be able to provide all the serial interfaces for testing theVSCI,
IIC, and SPI.
7. The board is able to get power from five sources. See Section 2.7.
8. The board is able to provide all serial signals available to the client through an accessible
serial header.
2.2 Minimal System Features
The following is a list of main components in the Minimal system:
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•Top view (see Figure 1-1):
MCF51CN128 —Uses a 48-pin QFN package to handle all theTCP/IP applications•
•Power LED—Turned on when the power is applied
•Reset button—Resets the MCF51CN128 processor
•Customized BDM for programming
•LDO on-board—Provides regulated 3.3V. The voltage must be between 3.7V and
5.5 V.
•Ethernet PHY 10/100 Mbps
•RJ45 connector
•Bottom view (see Figure 1-2):
•A single 25 MHz oscillator crystal—Feeds the MCF51CN128. The MCU then
feeds the Ethernet PHY clock.
2.3 Demo System Features
The following is the list of the Demo system main components:
•Top view (see Figure 1-1):
Standard 2 × 3 BDM connector•
•Serial header—All serial signals are mapped
•Temperature sensor by IIC
•ADC—Using a POT
•LED—General purpose LED
•Power can be supplied from:
Power jack—5.5 V max•
•Terminal block—5.5 V max
•Unused DB9 pin for power—5.5 V max
•Unused Ethernet cable pairs for power—5.5 V max
•Battery—3.3 V max
•Accelerometer sensor using SPI
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Demo System Features

•Two buttons connected to KBI pins
•RS485 output connector
•Female DB9 output connector
•Bottom view (see Figure 1-2):
•RS485 transceiver
•RS232 transceiver
•µSD card connector
2.4 Connection Between Minimal System and Demo System
Features
The following figure shows how the MCF51CN128 reference design hardware is divided
into a Minimal and Demo system.
A set of zero Ωresistors that connect both these systems are present and visible at the top
and bottom layers on the MCF51CN128 reference design hardware. Disconnecting these
registers isolate the Minimal system from the Demo system.
Figure 2-1. Board showing Minimal and Demo system
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Chapter 2 Hardware Description

2.5 Hardware Block Diagram
The following block diagram shows the features of the MCF51CN128 reference design
hardware. The components related to the Minimal System are shown in the color blue and
the components related to the Demo System are shown in the color green.
Figure 2-2. MCF51CN128 reference design hardware block diagram
The following figures show the main hardware components on the MCF51CN128 reference
design hardware.
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Hardware Block Diagram

Figure 2-3. MCF51CN128 reference design top view
Figure 2-4. MCF51CN128 reference design bottom view
Note
The serial header is not populated in Figure 2-3.
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Chapter 2 Hardware Description

2.6 Pinout Description
The following list shows how all the pins of the MCF51CN128 48-pin QFN are used
on the hardware:
Table 2-1. MCF51CN128 reference design hardware pin assignment
NotesFunc 2Func 1NamePin
VDD11Minimal System
VSS12
VDD213
VSS214
VDD325
VDDA26
VSSA27
VSSA28
VDD437
VSS438
PHYCLKPTA03
MII_MDIOPTA14
MII_MDCPTA25
MII_RXD3PTA36
MII_RXD2PTA47
MII_RXD1PTA58
MII_RXD0PTA69
MII_RX_DVPTA710
MII_RX_CLKPTB011
MII_RX_ERPTB112
MII_TX_CLKPTB316
MII_TX_ENPTB417
MII_TXD0PTB518
MII_TXD1PTB619
MII_TXD2PTB720
MII_TXD3PTC021
MII_COLPTC122
MII_CRSPTC223
EXTALPTD439
XTALPTD540
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Pinout Description

NotesFunc 2Func 1NamePin
PTC3 (RST)RESET24Shared
PTD6 (BKGD)BKGD41
Analog MUX SelectorGPIO (SELECT-
OR)
PTE346Demo System
Selection by Analog
MUX
ADP3 (POT)SPSCK2 (ACC)PTD742
GPIO (SD)MISO2 (ACC)PTE043
MOSI2 (ACC)PTE144
GPIO (LED)SS2 (ACC)PTE245
SS1 (SD)PTB215
Selection by Analog
MUX
MOSI1 (SD)GPIO (CTS)PTC530
MISO1 (SD)SCL2 (TEMP)PTC631
SPSCK1 (SD)SDA2 (TEMP)PTC732
TXD1 (RS232)PTD033
RXD1 (RS232)PTD134
TXD2 (RS485)PTD235
RXD2 (RS485)PTD336
KBI2P4 (SW2)PTE447
KBI2P5 (SW1)PTE548
GPIO (RTS)PTC429
2.7 MCF51CN128 Reference Design Board Power Options
The following figure shows the power options for the MCF51CN128 reference design board.
The options are listed below:
•Ethernet—Brown and blue pairs take power. Brown pair (pin 4 and 5) is positive and
blue pair (pin 7 and 8) is negative. The voltage drop due to the Ethernet cable length
must be considered when carrying power through the RJ45 cable.
Note
This is not power over Ethernet (PoE) but a way to power-up
the MCF51CN128 reference design board.
•UART—Pin 6, +5.5 V unregulated power
•Power jack connector (Default Power Source)
•Regulated 3.3 V jack connector
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Chapter 2 Hardware Description

Figure 2-5. MCF51CN128 reference design board power options schematic
2.8 Hardware Considerations
The following list shows all the hardware considerations:
•Due to a reduced number of pins to all the functions required by the Demo System, an
analog switch is required to switch between pin functions.
•The following list shows shared functions that must be used exclusively:
•µSD card reader and I2C (temperature sensor)
•rs232 hardware signals and second SPI port (accelerometer sensor)
•Accelerometer sensor and µSD card connector while containing a µSD card.
•General purpose LED and second SPI port (accelerometer sensor)
•POT and second SPI port (accelerometer sensor)
•When using the Ethernet cable as the power supply, the length of the cable must be
considered due to the voltage drop.
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Hardware Considerations