M
MCP250XX
Development Kit
User’s Guide
2004 Microchip Technology Inc.
DS51266C
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical
components in life support systems is not authorized except
with express written approval by Microchip. No licenses are
conveyed, implicitly or otherwise, under any intellectual
property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE and PowerSmart are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
AmpLab, FilterLab, microID, MXDEV, MXLAB, PICMASTER,
SEEVAL, SmartShunt and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Application Maestro, dsPICDEM, dsPICDEM.net,
dsPICworks, ECAN, ECONOMONITOR, FanSense,
FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP,
ICEPIC, Migratable Memory, MPASM, MPLIB, MPLINK,
MPSIM, PICkit, PICDEM, PICDEM.net, PICtail, PowerCal,
PowerInfo, PowerMate, PowerTool, rfLAB, rfPIC, Select
Mode, SmartSensor, SmartTel and Total Endurance are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2004, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in October
2003. The Company’s quality system processes and procedures are for
its PICmicro® 8-bit MCUs, KEEL OQ® code hopping devices, Serial
EEPROMs, microperipherals, nonvolatile memory and analog
products. In addition, Microchip’s quality system for the design and
manufacture of development systems is ISO 9001:2000 certified.
DS51266C-page ii
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Table of Contents
Preface ............................................................................................................................ 1
Chapter 1. Product Overview and Installation
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Introduction and Highlights ........................................................................ 5
What is the MCP250XX Development Kit? ............................................... 5
System Requirements .............................................................................. 5
MCP250XX Development Kit Components .............................................. 6
MCP2515 Components ............................................................................ 7
Hardware Installation .............................................................................. 10
Software Installation ............................................................................... 11
Chapter 2. MCP250XX Basic View Tutorial
2.1
2.2
2.3
2.4
2.5
Introduction ............................................................................................. 13
Highlights ................................................................................................ 13
Setting up the Basic Template Evaluation Mode .................................... 13
Establishing Communications ................................................................ 20
Explaining the CAN Messages ............................................................... 22
Chapter 3. MCP250XX Register View Tutorial
3.1
3.2
3.3
3.4
3.5
Introduction ............................................................................................. 23
Highlights ................................................................................................ 23
Setting up the Register Template Evaluation Mode ............................... 23
Establishing Communication .................................................................. 27
Explaining the Register Template Windows ........................................... 27
Chapter 4. Programming the MCP250XX User Defaults
4.1
4.2
4.3
4.4
Introduction ............................................................................................. 29
Highlights ................................................................................................ 29
Device Programmer ................................................................................ 29
Programming via the ICSP™ Connector ................................................ 34
Chapter 5. Other Capabilities of the Development Board
5.1
5.2
5.3
5.4
5.5
Introduction ............................................................................................. 35
Highlights ................................................................................................ 35
Oscillator Configurations ........................................................................ 35
Node A Prototyping Area and Header Pinout ......................................... 36
External Bus Connections ...................................................................... 37
2004 Microchip Technology Inc.
DS51266C-page iii
MCP250XX User’s Guide
Appendix A. Schematics and Layouts
A.1
A.2
A.3
A.4
A.5
A.6
A.7
Introduction ............................................................................................. 39
VPP Step-up Regulator ........................................................................... 40
Clock and Data for Programming ........................................................... 41
PC Node ................................................................................................. 42
CAN Physical Layer ................................................................................ 43
Node A and Node B ................................................................................ 44
Caps Page .............................................................................................. 45
Index ..............................................................................................................................47
Worldwide Sales and Service .....................................................................................48
DS51266C-page iv
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Preface
INTRODUCTION AND HIGHLIGHTS
This section provides general information that will be useful to know before using the
MCP250XX Development Kit and touches on the following topics:
•
•
•
•
•
About This Guide
Recommended Reading
Troubleshooting
The Microchip Internet Web Site
Customer Support
ABOUT THIS GUIDE
Document Layout
The User’s Guide layout is as follows:
• Chapter 1: Product Overview and Installation – details the hardware and
software components and discusses installation procedures.
• Chapter 2: MCP250XX Basic View Tutorial – covers some of the key elements
of the MCP250XX by going through the steps for setting up and running the
demonstration program.
• Chapter 3: MCP250XX Register View Tutorial – details the demonstration
software and the CAN system, as well as discussing the steps required to
successfully communicate with the MCP250XX while in the Register template.
• Chapter 4: Programming the MCP250XX Using the Development Board –
describes the procedure for programming the MCP250XX using the programming
circuitry and special software.
• Chapter 5: Other Capabilities of the MCP250XX Development Kit - details the
other capabilities of the MCP250XX Development Kit, including configuring the
board for multiple oscillators, connecting the board to the MCP2515 development
board and connecting the board to external CAN busses.
Appendices
• Appendix A: Schematics and Layouts – lists the schematics and layout
diagrams for the MCP250XX Development Kit.
• Index – cross-reference listing of terms, features and sections of this document.
• Worldwide Sales and Service – provides the address, telephone and fax
numbers for Microchip Technology Inc. sales and service locations throughout the
world.
Updates
Since Microchip tools are constantly evolving to meet customer needs, some software
dialogs and/or tool descriptions may differ from this document. Please refer to the
Microchip web site to obtain the latest documentation available (www.microchip.com).
2004 Microchip Technology Inc.
DS51266C-page 1
MCP250XX User’s Guide
RECOMMENDED READING
For more information regarding the MCP250XX devices and other CAN related topics,
the following are recommended reading. The following data sheets may be
downloaded from our internet web site at www.microchip.com.
MCP2502X/2505X Data Sheet (DS21664)
This data sheet provides detailed information regarding the MCP250XX CAN I/O
Expanders.
MCP2515 Data Sheet (DS21291)
This data sheet provides detailed information regarding the MCP2515 Stand-Alone
CAN Controller, which is the master node on the board.
PRO MATE® II User’s Guide (DS30082)
This manual contains a section explaining how to program the MCP250XX devices
using the specified socket module.
MCP250XX Programming Specification (DS20072)
This specification explains the requirements for programming the MCP250XX
using the ICSP™ protocol.
AN815 – Understanding the MCP250XX Devices (DS00815).
AN816 – A CAN System Using Multiple MCP250XX I/O Expanders (DS00816).
AN713 – An Introduction to the CAN Protocol Application Note (DS00713)
This application note provides “the basics” for those not familiar with the CAN
protocol.
AN754 – Understanding Microchip’s CAN Module Bit Timing Application Note
(DS00754)
This application note is an in-depth discussion of bit timing using Microchip’s CAN
module.
A CAN Kingdom by Lars-Berno Fredriksson (Kvaser AB)
This document covers the CAN Kingdom Specification and should help give some
insight into the main software and some of the menu items that refer to CAN
Kingdom-specific functions. For more information, please visit CAN Kingdom web
site at www.cankingdom.org
CANKing Help Files
The help files are a good resource for answering some common questions about
the MCP250XX Development Kit, including the CAN Kingdom-specific menu
items.
README Files
Contains the latest information on the MCP250XX evaluation system.
Microsoft® Windows® Manuals
These manuals assume that users are familiar with the Microsoft Windows
operating system. Many excellent references exist for this software program and
should be consulted for general operation of the Windows® operating system.
TROUBLESHOOTING
See the README files for information regarding common problems not addressed in this
user’s guide.
DS51266C-page 2
2004 Microchip Technology Inc.
Preface
THE MICROCHIP INTERNET WEB SITE
Microchip provides easy access to our documentation and on-line support through our
World Wide Web Site at www.microchip.com. You can download files from the web site
or from our FTP site at ftp://ftp.microchip.com.
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
•
•
•
•
•
Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Corporate Applications Engineer (CAE)
Hot Line
Customers should call their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers. See the
back cover for a listing of sales offices and locations.
Corporate applications engineers (CAEs) may be contacted at:
(480) 792-7627.
In addition, there is a Systems Information and Upgrade Line. This line provides system
users a listing of the latest versions of all of Microchip’s development systems software
products. Plus, this line provides information on how customers can receive any
currently available upgrade kits.
The Hot Line numbers are:
1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
2004 Microchip Technology Inc.
DS51266C-page 3
MCP250XX User’s Guide
NOTES:
DS51266C-page 4
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Chapter 1. Product Overview and Installation
1.1
INTRODUCTION AND HIGHLIGHTS
This chapter provides an overview of the MCP250XX Development Kit and covers the
following topics:
•
•
•
•
•
•
1.2
What is the MCP250XX Development Kit?
System Requirements
MCP250XX Development Kit Components
MCP2515 Components
Hardware Installation
Software Installation
WHAT IS THE MCP250XX DEVELOPMENT KIT?
The MCP250XX Development Kit is an evaluation, demonstration and development
tool for Microchip Technology’s 14-pin CAN I/O Expanders. The MCP250XX can be
evaluated easily by installing the provided software and running the demonstration
program. Furthermore, development can be accomplished by utilizing the bare CAN
node with the prototyping area, as well as with the on-board device programmer.
The development board has the ability to program the user-defined defaults by using
the device programmer module and the supplied software. Alternatively, the In-Circuit
Serial Programming™ (ICSP™) protocol can be used to program the MCP250XX
using the 5-pin header, which is connected to a 14-pin socket on the board. See the
MCP250XX Programming Specification (DS20072) for details on programming via
ICSP.
Some of the key features of the MCP250XX Development Kit include:
•
•
•
•
1.3
Evaluation of Microchip’s CAN I/O Expanders
Programming the MCP2505X devices using supplied software
Programming the MCP2505X devices via the ICSP protocol
Connectable to external CAN networks
SYSTEM REQUIREMENTS
To take full advantage of the MCP250XX features, you must install the supplied
demonstration/evaluation software on a host computer. The MCP250XX requires:
• Microsoft Windows 95/98/ME/NT/2000 operating system
• One free parallel port
• CD-ROM drive
2004 Microchip Technology Inc.
DS51266C-page 5
MCP250XX User’s Guide
1.4
MCP250XX DEVELOPMENT KIT COMPONENTS
The MCP250XX Development Kit contains:
•
•
•
•
•
•
•
•
MCP250XX Development Board
MCP250XX Development Kit User’s Guide
MCP250XX Development Kit CD-ROM with demo and programming software
Parallel port cable
9V DC power supply adapter
Warranty/Registration card
Three MCP25020 CAN I/O Expanders
Three MCP25050 CAN I/O Expanders
FIGURE 1-1:
DS51266C-page 6
MCP250XX DEVELOPMENT KIT
2004 Microchip Technology Inc.
Product Overview and Installation
1.5
MCP2515 COMPONENTS
The MCP2515 consists of four main parts (see Figure 1-4):
1.
2.
3.
4.
PC Node
Node A
Node B
Device Programmer
1.5.1
PC Node
The PC Node is the master node for the demonstration program that controls Node B.
This node contains a MCP2515 Stand-Alone CAN Controller that is controlled by the
host PC via a custom parallel port interface.
Note:
1.5.2
All three nodes are connected to a common CAN bus that has external
connections via the DB9 connector.
Node A
Node A is a bare CAN node next to the prototyping area. This node is used for
MCP250XX prototyping and can also be used to program the user defaults via the
ICSP protocol. See Figure 1-2 for pinout description.
FIGURE 1-2:
NODE A PINOUT
ICSP™ Header
MCP250XX
2004 Microchip Technology Inc.
VPP
1
14
VDD
2
13
VSS
3
12
DATA
4
11
5
10
6
9
7
8
CLOCK
DS51266C-page 7
MCP250XX User’s Guide
1.5.3
Node B
Node B is the slave node for the demonstration program. Analog inputs
(potentiometers), PWM outputs (piezo buzzer and incandescent lamp) and digital
inputs (push buttons) are all connected to the MCP25050 device. It responds to inputs
and CAN messages to demonstrate device functionality. See Figure 1-3 for the pinout
description.
FIGURE 1-3:
NODE B PINOUT
MCP250XX
GP0
LP1
R20
GP2
GP4
GP5
R17
VSS
1
14
2
13
3
12
4
11
5
10
6
9
7
8
VDD
S1
GP6
BZ1
S2
DS51266C-page 8
S3
S4
2004 Microchip Technology Inc.
Product Overview and Installation
1.5.4
Device Programmer
The Device Programmer module is used with PC software to configure the
user-defined defaults.
FIGURE 1-4:
MCP250XX DEVELOPMENT BOARD
DB25
J1
U3
U2
L1
Y1
U6
PC NODE
U15
Y2
Y3
NODE A
DEVICE PROGRAMMER
D2
D3
D4
D5
R17
R20 NODE B
100
100
J3
BZ1
J5
S1
U14
J4
GP4
1.5.5
GP5 GP6
Key Areas of the MCP2515
There are a few key areas on the board. Figure 1-4 illustrates these areas, while
Table 1-1 details them.
TABLE 1-1:
MCP250XX BOARD LAYOUT
Key Areas
Description
DB25
DB25 is the connection to the host PC interface. The PC controls both
the PC Node and the Device Programmer circuit.
U6
U6 is the CAN Controller (MCP2515) of the PC Node that is controlled
by the host PC.
U15, J5 and JP4
U15 is the prototyping node. J5 is the ICSP™ header for U15. JP4 jumpers board power to the VDD pin of U15 and should be removed if using
J5 (ICSP header) to isolate U15 from the rest of the board during
In-Circuit Serial Programming™.
U14
The MCP250XX for the demonstration program. Connected to the
potentiometers, piezo, buttons and lamp.
U3
U3 is the socket for programming the user-defined defaults using the
programming software.
Y1, Y2, Y3, JP1
and JP2
Y1, Y2 and Y3 are the oscillator sockets for each of the three CAN
nodes. By default, all of the Yx outputs are connected together (JP1 and
JP2 are shorted via a trace on the back of the board) and only Y1 is populated (i.e., Y1 clocks all three CAN nodes). To separate the oscillator
sockets, the traces shorting JP1 and JP2 must be cut.
U11, U12, U13, J3
and J4
U11-U13 are the CAN drivers all connected to a common CAN bus. The
two DB9s (J3 and J4) are the external CAN bus connections. Only J4 is
populated.
D2, D3, D4 and D5 CAN traffic indicator LEDs. D2 represents all traffic. D3-D5 represent
transmitted traffic of each of the three nodes.
2004 Microchip Technology Inc.
DS51266C-page 9
MCP250XX User’s Guide
1.6
HARDWARE INSTALLATION
1.6.1
Connecting the DB25 Cable
The included DB25 cable is a male-to-male configuration and plugs into the parallel
port of the host PC. Figure 1-5 shows the pin configuration.
11
12
24
13
25
G
N
G
N
D
D
23
D
10
22
G
N
G
N
G
N
D
D
D
9
21
D
8
20
D
7
19
G
N
6
18
G
N
/C
/C
5
17
G
N
4
16
N
/C
N
/C
N
1.6.2
3
15
N
2
14
SP
I_
SP
I_
/C
N
1
DB25 PIN CONFIGURATION
SO
/P
gm
D
SC
at
aO
K
SP
/P
ut
gm
I_
C
C
S/
lk
Pg
O
25
ut
m
15
D
R
a
ES
ta
W
ET
25
R
15
/P
EN
gm
R
TS
VP
25
O
P_
/P
15
g
O
R
m
N
TS
VD
1/
25
D
P
_O
15
gm
R
N
C
TS
L
Bu
KE
2
ffe
N
rE
na
25
bl
e
15
IN
T/
Pg
SP
m
I_
D
SI
AT
A_
25
15
IN
R
XB
F0
25
15
R
XB
F1
FIGURE 1-5:
9V Power Supply Adapter
The power supply is rated at 9V, 750 mA DC.
1.6.3
DB9 External CAN Bus Connectors (optional)
The DB9 connector, as shown in Figure 1-6, is used to connect the MCP2515 to an
external CAN bus and is not necessary for basic board operation.
Only the DB9 at J4 is populated. J3 is available as needed.
D
DB9 CAN CONNECTOR
d
N
R
8
/C
es
er
ve
AN
4
/C
AN
H
7
5
9
C
C
N
/C
6
3
_V
+
2
N
1
C
C
R
es
AN
L
er
ve
_G
N
d
FIGURE 1-6:
AN
Note:
DS51266C-page 10
2004 Microchip Technology Inc.
Product Overview and Installation
1.7
SOFTWARE INSTALLATION
Insert the MCP250XX Development Kit CD-ROM into the CD-ROM drive.
1.7.1
Auto-run Enabled
If auto-run is enabled, the installation program will automatically start. Follow the
instructions on the screen to install the software.
1.7.2
Auto-run Not Enabled
If auto-run is not enabled:
1. Click the Start button and select Run. Enter d:\setup.exe
(where d:\ is your CD-ROM drive). Click OK. Or alternatively, find the CDROM
drive using “Windows Explorer” and double click “setup.exe”.
Note:
Windows NT® and Windows 2000 users must have administrative
privileges in order to install the MXLAB® software.
2. Follow the online instructions to install the software.
2004 Microchip Technology Inc.
DS51266C-page 11
MCP250XX User’s Guide
NOTES:
DS51266C-page 12
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Chapter 2. MCP250XX Basic View Tutorial
2.1
INTRODUCTION
This tutorial discusses the evaluation portion of the kit, details the demonstration software (Basic template), CAN system (PC Node and Node B) and covers the steps
required to successfully run the demonstration network.
The user defaults for Node B are preprogrammed at the factory. Therefore, no user
default programming is necessary. No discussion of programming user defaults will
take place in this chapter, as this is detailed in Chapter 4. “Programming the
MCP250XX User Defaults”.
Note:
2.2
The software must be installed and the hardware connected to run the
demonstration program.
HIGHLIGHTS
This chapter covers the following topics:
• Setting up Evaluation mode
• Establishing communications
• Explaining the CAN messages
2.3
SETTING UP THE BASIC TEMPLATE EVALUATION MODE
The MCP250XX Development Kit’s “Basic” template contains the following major
elements:
1. Menu Bar (Figure 2-1) – The layout is typical of most Windows menu bars.
2. PC Node Bit Timing and Mode (Figure 2-2) – The bit timing and the mode of
operation (Normal and Configuration) for the MCP2515 (PC Node) are
configured with this window.
3. Board Status (Figure 2-3) – Indicates if the board is connected to the PC and
also indicates the parallel port address used.
4. Message Format Window (Figure 2-4) – Selects how CAN messages are
formatted and interpreted. The default is “Standard Text Format” and is used for
the demonstration program. The other format is used with the CAN Kingdom
higher layer protocol.
5. Bus Monitor Window (Figure 2-5) – Also known as the “Output” window. This
window shows all bus traffic.
6. MCP250XX Demonstration (Figure 2-6) – This window is the graphical
interpretation of Node B (the demonstration node).
FIGURE 2-1:
2004 Microchip Technology Inc.
MENU BAR
DS51266C-page 13
MCP250XX User’s Guide
DS51266C-page 14
FIGURE 2-2:
PC NODE BIT TIMING AND MODE
FIGURE 2-3:
BOARD STATUS
2004 Microchip Technology Inc.
MCP250XX Basic View Tutorial
FIGURE 2-4:
MESSAGE FORMAT WINDOW
FIGURE 2-5:
BUS MONITOR WINDOW
2004 Microchip Technology Inc.
DS51266C-page 15
MCP250XX User’s Guide
FIGURE 2-6:
DS51266C-page 16
MCP250XX DEMONSTRATION WINDOW
2004 Microchip Technology Inc.
MCP250XX Basic View Tutorial
2.3.1
Starting the Program
1. Start the software by any of the following:
• From the “Start” menu, select “Programs > Microchip > CANKing”
• Select “C:\Program Files\Microchip\Mcan\WC32.exe”
• Double-click on the desktop icon for the MCP250XX Development Kit
2. A notice will appear warning of the potential undesired results if connecting to an
existing CAN bus (Figure 2-7). Select “OK, I know what I am doing”.
3. A dialog will appear asking if a new template or a saved project should be
opened. Select “New Template” (Figure 2-9).
4. When the template dialog appears, select “MCP250XX Evaluation”
(Figure 2-10).
The software is now started. There are a few other options that the user may want to
configure for convenience before saving the project and capturing the defaults.
2.3.2
Setting the Numeric Base for Transmit and Monitor Windows
The default numeric base can be changed, as desired, for both the Transmit Buffer
window and the Bus Monitor window. Base 16 (hex) numbers are preceded by a “$”.
2.3.2.1
TRANSMIT BUFFER WINDOW
The numeric base for the transmit buffer is configured by selecting “Options > Global...”
from the menu. Check desired numeric base.
2.3.2.2
BUS MONITOR WINDOW
If the Select Formatters window is not visible, select it from the View menu. Highlight
(do not uncheck) Standard Text Format in the Select Formatters window. Click
Properties and check the desired numeric base (see Figure 2-8).
A few other items must be addressed before proper communication can occur. These
are discussed in the next section.
2004 Microchip Technology Inc.
DS51266C-page 17
MCP250XX User’s Guide
DS51266C-page 18
FIGURE 2-7:
WARNING ON START-UP
FIGURE 2-8:
CHANGING NUMERIC BASE FOR BUS MONITOR
2004 Microchip Technology Inc.
MCP250XX Basic View Tutorial
FIGURE 2-9:
OPEN DIALOG
FIGURE 2-10:
TEMPLATE DIALOG
2004 Microchip Technology Inc.
DS51266C-page 19
MCP250XX User’s Guide
2.4
ESTABLISHING COMMUNICATIONS
When the software is started from a new template (as it must be the first time it is
started), some steps must be taken to insure proper operation and to set up the
software defaults. These defaults can be saved by saving the template as a project
and opening the project in subsequent sessions.
2.4.1
Configure Parallel Port
The board status (including parallel port address and connection status) is indicated in
the Board Status window (Figure 2-3). Assuming the port address, as displayed in the
window, matches the address as configured by the PC, the board status should
indicate “connected”, with the indicator in the window being green.
If the status indicator is red and indicates “not connected”, check the port address. To
change the port address that the software uses, select “Options > MCP2515” and enter
the correct port address in the appropriate dialog box (Figure 2-11).
Note:
Port address is entered as a hex value.
FIGURE 2-11:
2.4.2
PC NODE OPTIONS
Match Oscillator Frequency with Board
The CAN data rate is a function of the oscillator frequency. Therefore, the proper
oscillator frequency must be set in order for the software to calculate the CAN data rate
correctly. Open the same window that was opened to set the parallel port address
(Figure 2-11). The frequency of oscillation units are displayed in kilohertz (kHz).
DS51266C-page 20
2004 Microchip Technology Inc.
MCP250XX Basic View Tutorial
2.4.3
Configuring the Output Window Display Format
The Output (Bus Monitor) window (Figure 2-5) can display the CAN messages in five
different ways:
1. Fixed Positions – Messages with the same identifier maintain a fixed position
(slot) within the window. The data and time-stamp update normally. To turn fixed
positions on/off, right-click the mouse while the cursor is over the Output window
area and select “Fixed Positions”.
2. Dynamic Positions (Fixed Positions = off) – Each new message is displayed
below the previous message, regardless of the identifier. This mode is activated
by unchecking Fixed Positions (right mouse click).
3. Auto-Scroll – Keeps the Output window from auto-scrolling to the most recent
message (bottom message). This is useful when messages are being regularly
received and the user would like to observe old messages at the top of the buffer
without having the focus shift to the end of the buffer each time a message is
received.
To activate, right-click the mouse while the cursor is over the Output window and
select “Auto-Scroll”.
4. Delta Time – This is a time-stamp that indicates the time(s) between two
messages with the same identifier. Delta time is activated as follows (Figure 2-8):
If the Select Formatters window is not visible, select it from the View menu.
Highlight (do not uncheck) the “Standard Text Format” option in the Select
Formatters window. Click Properties and check the “Delta Times” box.
5. Free-Running Time – A free-running time-stamp between messages with the
same identifiers. This mode is activated by unchecking the “Delta Times” box.
2004 Microchip Technology Inc.
DS51266C-page 21
MCP250XX User’s Guide
2.5
EXPLAINING THE CAN MESSAGES
At this point, the two nodes (PC Node and Node B) should be communicating normally
and a message should be showing up in the Output window (Figure 2-5) at regular
intervals. Pushing GP4, GP5 or GP6 causes other messages to show up in the Output
window, with the status being reflected graphically in the Demo window. Turning the
potentiometers will cause the data fields to change.
This section explains the CAN messages as seen in the Output (Bus Monitor) window.
TABLE 2-1:
DS51266C-page 22
CAN MESSAGES EXPLAINED
Identifier
Length
Data
Explanation
0x008
3
“Write Register” Input Message
(IM)
DB0 (address) is either 0x23 or 0x26
(PR1 or PWM2DCH).
0x018
8
Read A/D Regs
“Read A/D Regs“ IRM followed by
OM.
0x280
0
None
On-bus message.
0x290
8
Read A/D Regs
A/D Threshold Detection (R20, POT
and PWM2 duty cycle).
0x7FF
0
None
Command Acknowledge in response
to IM.
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Chapter 3. MCP250XX Register View Tutorial
3.1
INTRODUCTION
A few topics covered in this chapter were also covered in the last chapter detailing the
Basic template tutorial. To avoid duplication, the appropriate sections of Chapter 2
“MCP250XX Basic View Tutorial” will be referenced.
This chapter details the demonstration software (Register template) and CAN system
(PC Node and Node B). It also covers the steps required to successfully communicate
with the MCP250XX while in the Register template.
Note:
3.2
The software must be installed, and the hardware connected, to run the
demonstration program.
HIGHLIGHTS
This chapter covers the following topics:
• Setting up the Evaluation Mode
• Establishing Communications
• Explaining the Windows
3.3
SETTING UP THE REGISTER TEMPLATE EVALUATION MODE
The MCP250XX Development Kit’s “Register” template contains the following major
elements that will be discussed, in detail, later in this chapter:
1. The Menu Bar, PC Node Bit Timing and Mode and Board Status windows are
all discussed in Section 2.3 “Setting up the Basic Template Evaluation
Mode”.
2. MCP250XX Filters – Used to set up and test the MCP250XX mask and filters.
3. MCP250XX Error Status – Used to read the current Transmit and Receive Error
Counters (TEC and REC), as well as the EFLG register.
4. MCP250XX Physical Layer – Displays the bit timing registers (CNF1, CNF2 and
CNF3).
5. MCP250XX Command Messages – Implements the command messages as
described in the data sheet. Information Request Messages (IRM), output and
input messages are all represented in this window to enable the main
functionality of the MCP250XX.
2004 Microchip Technology Inc.
DS51266C-page 23
MCP250XX User’s Guide
DS51266C-page 24
FIGURE 3-1:
MCP250XX FILTERS
FIGURE 3-2:
MCP250XX ERROR STATES
2004 Microchip Technology Inc.
MCP250XX Register View Tutorial
FIGURE 3-3:
2004 Microchip Technology Inc.
MCP250XX PHYSICAL LAYER
DS51266C-page 25
MCP250XX User’s Guide
FIGURE 3-4:
MCP250XX COMMAND MESSAGES
3.3.1
Starting the Program
Because the start procedures are the same as in Section 2.3.1 “Starting the
Program”, there are references to figures in Chapter 2 “MCP250XX Basic View
Tutorial” in this section.
1. Start the software by any of the following:
• From the “Start” menu, select “Programs > Microchip > CANKing”
• Or select “C:\Program Files\Microchip\Mcan\WC32.exe”
• Or double-click on the desktop icon for the MCP250XX Development Kit
2. A notice will appear warning of the potential undesired results if connecting to an
existing CAN bus (Figure 2-7). Select “OK, I know what I am doing”.
3. Next, a dialog will appear asking if a new template or a saved project should be
opened. Select “New Template” (Figure 2-9).
4. When the template dialog appears, select “MCP250XX Evaluation”
(Figure 2-10).
DS51266C-page 26
2004 Microchip Technology Inc.
MCP250XX Register View Tutorial
3.3.2
Setting the Numeric Base for Bus Monitor Window
If the Select Formatters window is not visible, select it from the View menu. Highlight
(do not uncheck) “Standard Text Format” in the Select Formatters window. Click
Properties and check the desired numeric base (see Figure 2-8).
A few other items must be addressed before proper communication can occur, as
discussed in the next section.
3.4
ESTABLISHING COMMUNICATION
Because the method for establishing communications is exactly the same as the last
chapter, please refer to Section 2.4, “Establishing Communications”.
3.5
EXPLAINING THE REGISTER TEMPLATE WINDOWS
The Register template provides access to all of the user registers by using the
command messages as defined in the data sheet.
3.5.1
General Information
There are three different ways to enter values into the windows, depending on the
window function:
1. Entering byte value in the appropriate box.
2. Clicking up/down counters to increase/decrease the value by one.
3. Double-clicking the desired bit location to toggle the bit to its opposite state.
The register bit names will be displayed for the location directly under the mouse
pointer (Physical Layer and Configuration windows only).
3.5.2
MCP250XX Filters Window
The MCP250XX Filters window allows the user to read, modify and test the mask and
filters settings. Care must be taken when modifying the mask and filter settings, as all,
or partial communications with the MCP250XX may be lost due to improper filter and
mask settings.
Mask and filter settings can be tested against various identifiers simply by entering the
desired identifier in the Test Identifier window and pressing the “Test Buf” button. This
tests the entered identifier with the entered mask and filter settings, indicating pass/fail
for each filter.
Example 3.1: Figure 3-1 shows a test where the mask is configured to accept IDs of
Eh and Fh only (bit 0 = 0 = “don’t care”).
2004 Microchip Technology Inc.
DS51266C-page 27
MCP250XX User’s Guide
3.5.3
MCP250XX Error States
The current Receive and Transmit Error Counters (REC and TEC) can be read, as can
the EFLG register. The is the same as the “Read CAN Error” Information Request
Message (IRM).
3.5.4
MCP250XX Physical Layer
The bit timing (CNF registers) cannot be changed from the default values. However,
these registers can be read and displayed along with the parsed prescaler and T Q
settings.
3.5.5
MCP250XX Command Messages
This window implements the command messages as described in the data sheet. Both
IRMs and input messages can be implemented by selecting the appropriate radio
button (see Figure 3-4).
This window also gives the added functionality of reading and/or writing individual
registers. Reading individual registers is actually an IRM that contains the desired
register (e.g., reading IOINTEN register is actually a “Read Control Register” IRM
command with the resulting output message). Writing an individual register is a “Write
Register” input command.
DS51266C-page 28
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Chapter 4. Programming the MCP250XX User Defaults
4.1
INTRODUCTION
The user memory for MCP250XX devices is initially blank when shipped from the
factory. The user must program the user memory with user-defined defaults. There are
three methods for programming the user memory.
1. Using MPLAB® IDE with the PRO MATE® II device programmer and the
MCP250XX socket module.
2. Using the device programmer circuit on the MCP2515 with the programming
software.
3. In-Circuit Serial Programming™ (ICSP™) while following the MCP250XX
Programming Specification (DS20072).
4.2
HIGHLIGHTS
The MCP250XX Development Kit supports two methods for programming the user
defaults.
1. Using the Device Programmer circuit with the programming software.
2. Node A has an ICSP connector.
4.3
DEVICE PROGRAMMER
A device programmer circuit is built into the board to allow the user to easily program
MCP250XX devices with the existing board (i.e., PRO MATE II is not needed).
4.3.1
Circuit Description
The programming circuitry is designed to use the ICSP methodology as defined in the
MCP250XX Programming Specification (DS20072). The circuitry routes all of the
required signals, including the 13V VPP signal that is generated by a step-up voltage
regulator. Figure 4-1 shows the pinout for the MCP250XX socket in the device
programmer circuitry.
2004 Microchip Technology Inc.
DS51266C-page 29
MCP250XX User’s Guide
FIGURE 4-1:
DEVICE PROGRAMMER DIAGRAM
To Host PC
MCP250XX
1
14
2
13
3
12
4
11
5
10
6
9
7
8
Step-up Regulator
Circuit
4.3.2
PC Software
The programming circuitry is controlled by a host PC application through the DB25
connector. The PC application is a graphical interface that allows the device to be
quickly and easily configured with the user defaults. Figure 4-2 shows the main screen,
which is used to navigate to all of the MCP250XX device peripherals that can be
configured with the defaults.
The other screens, as shown in Figure 4-3 thru Figure 4-7, are used to configure all
peripherals. Together, both the hardware and software use the ICSP methodology as
described in the MCP250XX programming specification.
The software has the ability to save user defaults into IHEX8 format, which can be
imported to the PRO MATE II device programmer through MPLAB® IDE for
programming the MCP250XX devices.
DS51266C-page 30
2004 Microchip Technology Inc.
Programming the MCP250XX User Defaults
FIGURE 4-2:
PROGRAMMER SOFTWARE MAIN SCREEN
FIGURE 4-3:
USER MEMORY
Screen Capture
2004 Microchip Technology Inc.
DS51266C-page 31
MCP250XX User’s Guide
DS51266C-page 32
FIGURE 4-4:
CAN MODULE
FIGURE 4-5:
PWM MODULES
2004 Microchip Technology Inc.
Programming the MCP250XX User Defaults
FIGURE 4-6:
A/D MODULE
FIGURE 4-7:
GPIO MODULE
2004 Microchip Technology Inc.
DS51266C-page 33
MCP250XX User’s Guide
4.4
PROGRAMMING VIA THE ICSP™ CONNECTOR
There is an ICSP connector on Node A that can be used to program the user defaults
with an external programmer. To insure successful programming, the MCP250XX
Programming Specification (DS20072) must be adhered to.
The JP4 jumper allows the MCP250XX socket to be isolated from board power so the
programmer does not have to drive the board while programming.
FIGURE 4-8:
PROGRAMMING VIA THE ICSP™ CONNECTOR
VDD
MCP250XX
DS51266C-page 34
JP4
ICSP™
Connector
VPP
1
14
VDD
2
13
VSS
3
12
DATA
4
11
5
10
6
9
7
8
CLOCK
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Chapter 5. Other Capabilities of the Development Board
5.1
INTRODUCTION
The capabilities and configurations of the MCP2515 are discussed in this chapter.
5.2
HIGHLIGHTS
This chapter discusses:
• Oscillator Configurations
• Node A Prototyping Area and Header Pinout
• External CAN Bus Connections
5.3
OSCILLATOR CONFIGURATIONS
The MCP2515 is configured, by default, to use a common oscillator for all three CAN
nodes. While there are three oscillator sockets, only one is populated. The oscillator
sockets are connected together with their outputs. The two jumpers (JP1 and JP2) can
be used to disconnect the outputs and use individual oscillators for the nodes. The
jumpers are shorted by a trace on the bottom of the board by default. These traces can
be cut and jumper pins can be installed to control the oscillator output wiring. See
Figure 5-1 for details on the oscillator configurations.
FIGURE 5-1:
OSCILLATOR SOCKET LAYOUT
Y1
Y2
Y3
Out
Out
Out
To Node B
To PC Node
JP2
To Node A
JP1
Shorted by trace on
bottom of board
2004 Microchip Technology Inc.
DS51266C-page 35
MCP250XX User’s Guide
5.4
NODE A PROTOTYPING AREA AND HEADER PINOUT
In addition to ICSP capabilities, Node A can also be used for prototyping custom
MCP250XX configurations. This node has a prototyping area as well as a header that
can be used for probing the MCP250XX pinout. Figure 5-2 shows the layout of the
header.
Note:
JP4 must be shorted to enable board power to the MCP250XX socket.
FIGURE 5-2:
NODE A HEADER LAYOUT
Node A Header
GP0
GP1
GP2
GP3
GP4
GP5
GP6
GP7
TXCAN
DS51266C-page 36
RXCAN
2004 Microchip Technology Inc.
Other Capabilities of the Development Board
5.5
EXTERNAL BUS CONNECTIONS
The MCP2515 can be connected to an external CAN bus through the DB9(s). The DB9
pinout is the same as the defacto standard, as recommended by the CAN in
Automation (CiA) group. At a minimum, CANH (pin 7) and CANL (pin 2) must be
connected. However, CAN_GND (pin 3) and CAN_V+ (pin 9) may also be connected
to supply power to and from another board. Table 5-1 and Figure 5-3 show the pinout
and connector, respectively.
If supplying power to or from the MCP2515, be sure the voltage regulator
specification is not violated.
CAN CONNECTOR PINOUT
Description
Reserved
2
CANL
3
CAN_GND
4
—
5
N/C
Not connected
6
N/C
Not connected
7
CANH
8
—
9
CAN_V+
CAN ground
Reserved
CAN high bus line
Reserved
CAN power
D
EXTERNAL CAN BUS CONNECTOR
3
er
/C
8
/C
N
4
N
AN
H
7
5
9
C
C
ve
d
_G
N
C
2
6
/C
C
AN
es
R
1
N
AN
L
er
ve
d
FIGURE 5-3:
CAN low bus line
es
—
R
Name
1
+
Pin#
_V
TABLE 5-1:
AN
Note:
2004 Microchip Technology Inc.
DS51266C-page 37
MCP250XX User’s Guide
NOTES:
DS51266C-page 38
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Appendix A. Schematics and Layouts
A.1
INTRODUCTION
This appendix contains the schematics and layouts for the
MCP250XX Development Kit.
Diagrams included in this appendix include:
•
•
•
•
•
•
VPP Step-Up Regulator circuit
Programming Clock/Data Logic circuit
PC Interface/CAN Node circuit
CAN Bus Interface circuit
Node A/Node B circuit
Capacitors circuit
2004 Microchip Technology Inc.
DS51266C-page 39
GND
11
GND
15
12
4
CAP
VREF 8
OAOUT
SWC 16
3
SWE
DRVC
VIN 13
14
SENSE
LM78S40
1 CATHODE
2
ANODE
7
OAIN–
6 OAIN+
5
OAV
COMPIN–
9 COMPIN+
10
C7
GND
.25 - 1%
R1
R3
680 pF
L1
GND
{Value}
A
D1
K
R4
100 µF - 16V 6.3 MM
DS51266C-page 40
23.7K
GND
C3
2.21K - 1%
GND
.1 µF
C4
GND
GND
.1 µF
C5
µ
GND
.1 µF
C6
VCC
NV PP _ON
µ
NV PP _ON
Q1
100
R2
Q3
PFET – MTSF2P02
VDD
Q2
PFET – MTSF2P02
V PP
FIGURE A-1:
R7
A.2
10K
U2
VCC
VCC
MCP250XX User’s Guide
VPP Step-up Regulator
VPP STEP-UP REGULATOR CIRCUIT
2004 Microchip Technology Inc.
R8
10K
R5
160
A.3
CLOCK AND DATA FOR PROGRAMMING
FIGURE A-2:
PROGRAMMING CLOCK/DATA LOGIC CIRCUIT
VCC
VCC
VDD
VDD
VPP
SN74AHCT1G126
VSS
SN74AHCT1G126
2004 Microchip Technology Inc.
MCP25050
DS51266C-page 41
MCP250XX User’s Guide
A.4
PC NODE
PC INTERFACE/CAN NODE CIRCUIT
VSS
MCP2515
VCC
VCC
VCC
.1 µF
.1 µF
FIGURE A-3:
DS51266C-page 42
2004 Microchip Technology Inc.
A.5
CAN PHYSICAL LAYER
CAN BUS INTERFACE CIRCUIT
2004 Microchip Technology Inc.
VCC
MCP2551
VREF
VREF
VCC
MCP2551
VCC
VCC
VCC
VREF
MCP2551
VCC
VCC
FIGURE A-4:
DS51266C-page 43
MCP250XX User’s Guide
A.6
NODE A AND NODE B
NODE A/NODE B CIRCUIT
DS51266C-page 44
VCC
2.2 µF
VCC
VCC
MCP25050
VSS
VDD
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VDD
MCP25050
VSS
VCC
™
VCC
FIGURE A-5:
2004 Microchip Technology Inc.
A.7
CAPS PAGE
FIGURE A-6:
CAPACITORS CIRCUIT
VCC
VCC
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
2004 Microchip Technology Inc.
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
VCC
.1 µF
.1 µF
VCC
33 µF
100 pF
DS51266C-page 45
MCP250XX User’s Guide
NOTES:
DS51266C-page 46
2004 Microchip Technology Inc.
M
MCP250XX USER’S GUIDE
Index
B
R
Basic View Tutorial:
Setting the Numeric Base ................................. 17
Setting up the Basic Template .......................... 13
Starting the Program......................................... 17
Board Components .................................................... 7
Recommended Reading ............................................ 2
Register Template Windows .................................... 27
Register View Tutorial:
Setting the Numeric Base ................................. 27
Setting Up the Evaluation Mode ....................... 23
Starting the Program......................................... 26
C
CAN Messages ........................................................ 22
Customer Support ...................................................... 3
D
Document Layout ....................................................... 1
E
Establishing Communications .................................. 20
H
Hardware Installation ............................................... 10
I
Installing:
Hardware .......................................................... 10
Software............................................................ 11
S
Schematic and Layouts............................................ 39
Software Installation................................................. 11
System Requirements................................................ 5
T
Troubleshooting ......................................................... 2
U
Updates...................................................................... 1
W
What is the MCP250XX Development Kit? ................ 5
K
Kit Components ......................................................... 6
M
Microchip Internet Web Site ....................................... 3
O
Other Capabilities:
External Bus Connections .................................. 7
External CAN Bus Connector ............................. 7
Oscillator Configurations................................... 35
Prototyping Area ............................................... 36
P
Product Overview and Installation:
Board Components ............................................. 7
Key Areas of the Development Board ................ 6
Kit Components .................................................. 6
System Requirements ........................................ 5
Programming the User Defaults:
Device Programmer .......................................... 29
PC Software...................................................... 30
Programming via the ICSP™ Connector .......... 34
2004 Microchip Technology Inc.
DS51266C-page 47
M
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01/26/04
DS51266C-page 48
2004 Microchip Technology Inc.