Tektronix TMS143 Instruction Manual
Instruction Manual
TMS 143
MCS251 Microcontroller Support
070-9912-00
Warning
The servicing instructions are for use by
qualified personnel only. To avoid personal
injury, do not perform any servicing unless you
are qualified to do so. Refer to all safety
summaries prior to performing service.
Copyright T ektronix, Inc. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and are
protected by United States copyright laws and international treaty provisions.
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the
Rights in T echnical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the
Commercial Computer Software – Restricted Rights clause at F AR 52.227-19, as applicable.
T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
SOFTWARE WARRANTY
T ektronix warrants that the media on which this software product is furnished and the encoding of the programs on
the media will be free from defects in materials and workmanship for a period of three (3) months from the date of
shipment. If a medium or encoding proves defective during the warranty period, T ektronix will provide a
replacement in exchange for the defective medium. Except as to the media on which this software product is
furnished, this software product is provided “as is” without warranty of any kind, either express or implied.
T ektronix does not warrant that the functions contained in this software product will meet Customer’s
requirements or that the operation of the programs will be uninterrupted or error-free.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period. If T ektronix is unable to provide a replacement that is free from defects in materials and
workmanship within a reasonable time thereafter, Customer may terminate the license for this software product
and return this software product and any associated materials for credit or refund.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS
OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPLACE DEFECTIVE MEDIA OR REFUND CUSTOMER’S PAYMENT IS
THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS
WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER
TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.
HARDWARE WARRANTY
T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If a product proves defective during this
warranty period, T ektronix, at its option, either will repair the defective product without charge for parts and labor,
or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by T ektronix, with
shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the T ektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than T ektronix representatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-T ektronix supplies; or d) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time
or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS
OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUST OMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT , SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR
THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
Getting Started
Operating Basics
General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface: Microcontroller Support Documentation ix. . . . . . . . . . . . . . .
Manual Conventions ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Analyzer Documentation x. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting T ektronix x. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Support Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Analyzer Software Compatibility 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Analyzer Configuration 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements And Restrictions 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functionality Not Supported 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting To A System Under Test 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
With A PLCC Probe Adapter 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Without A Probe Adapter 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel Assignments 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU To Channel Probe Connections 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Up the Support 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel Group Definitions 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Data Is Acquired 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clocking Options 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Custom Clocking 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acquiring and Viewing Disassembled Data 2–5. . . . . . . . . . . . . . . . . . . . .
Acquiring Data 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Viewing Disassembled Data 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Display Format 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Display Format 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Flow Display Format 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Subroutine Display Format 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing How Data Is Displayed 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cycle Marking 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Display Selections 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Exception Vectors 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TMS 143 MCS251 Microcontroller Support Instruction Manual
i
Table of Contents
Specifications
Probe Adapter Description 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specification T ables 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Replacing Signal Leads 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Protective Sockets 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Electrical Parts
Parts Ordering Information 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Electrical Parts List 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams and Circuit Board Illustrations 5–5. . . . . . . . . . . . . . . . . . . . . .
Symbols 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Values 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graphic Items and Special Symbols Used in This Manual 5–5. . . . . . . . . . . . . . . . .
Component Locator Diagrams 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Mechanical Parts
Index
Parts Ordering Information 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Mechanical Parts List 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
TMS 143 MCS251 Microcontroller Support Instruction Manual
List of Figures
List of Tables
Table of Contents
Figure 1–1: Placing a microcontroller into a PLCC probe adapter 1–3. .
Figure 1–2: Connecting probes to a PLCC probe adapter 1–4. . . . . . . . .
Figure 1–3: Placing a PLCC probe adapter onto the SUT 1–4. . . . . . . . .
Figure 2–1: MCS251 bus timing 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–2: Hardware display format 2–6. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: Dimensions of the probe adapter 3–3. . . . . . . . . . . . . . . . . . . .
Figure 1: MCS251 probe adapter exploded view 6–4. . . . . . . . . . . . . . . . .
Table 1–1: Control group channel assignments 1–6. . . . . . . . . . . . . . . . . .
Table 1–2: Address group channel assignments 1–6. . . . . . . . . . . . . . . . . .
Table 1–3: Clock channel assignments 1–7. . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–4: CPU to Address channels 1–7. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–5: CPU to Control channels 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–6: CPU to Clock channels 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–7: J110 pin-out 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–1: Control group symbol table definitions 2–3. . . . . . . . . . . . . . .
Table 2–2: Meaning of special characters in the display 2–5. . . . . . . . . .
Table 2–3: Cycle type definitions 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–4: Exception vectors 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–1: Electrical specifications 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–2: Environmental specifications 3–2. . . . . . . . . . . . . . . . . . . . . . .
TMS 143 MCS251 Microcontroller Support Instruction Manual
iii
Table of Contents
iv
TMS 143 MCS251 Microcontroller Support Instruction Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
To Avoid Fire or
Personal Injury
Connect and Disconnect Properly . Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Ground the Product. This product is indirectly grounded through the grounding
conductor of the mainframe power cord. To avoid electric shock, the grounding
conductor must be connected to earth ground. Before making connections to the
input or output terminals of the product, ensure that the product is properly
grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and marking on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry .
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
TMS 143 MCS251 Microcontroller Support Instruction Manual
v
General Safety Summary
Symbols and Terms
T erms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
T erms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
WARNING
High Voltage
Protective Ground
(Earth) T erminal
CAUTION
Refer to Manual
Double
Insulated
vi
TMS 143 MCS251 Microcontroller Support Instruction Manual
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect Power. To avoid electric shock, disconnect the main power by means
of the power cord or, if provided, the power switch.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.
TMS 143 MCS251 Microcontroller Support Instruction Manual
vii
Service Safety Summary
viii
TMS 143 MCS251 Microcontroller Support Instruction Manual
Preface: Microcontroller Support Documentation
This instruction manual contains specific information about the TMS 143
MCS251 microcontroller support and is part of a set of information on how to
operate this product on compatible Tektronix logic analyzers.
If you are familiar with operating microcontroller supports on the logic analyzer
for which the TMS 143 MCS251 support was purchased, you will probably only
need this instruction manual to set up and run the support.
If you are not familiar with operating microcontroller supports, you will need to
supplement this instruction manual with information on basic operations to set up
and run the support.
Information on basic operations of microcontroller supports is included with each
product. Each logic analyzer has basic information that describes how to perform
tasks common to supports on that platform. This information can be in the form
of online help, an installation manual, or a user manual.
This manual provides detailed information on the following topics:
H Connecting the logic analyzer to the system under test
Manual Conventions
H Setting up the logic analyzer to acquire data from the system under test
H Acquiring and viewing disassembled data
H Using the probe adapter
This manual uses the following conventions:
H In this manual, MCS251 refers to all supported variations of the MCS251
microcontroller unless otherwise noted.
H An asterisk following a signal name indicates an active low signal.
H In the information on basic operations, the term “XXX” or “P54C” used in
field selections and file names must be replaced with MCS251. This is the
name of the microcontroller in field selections and file names you must use
to operate the MCS251 support.
H The term “disassembler” refers to the software that disassembles bus cycles
into instruction mnemonics and cycle types.
TMS 143 MCS251 Microcontroller Support Instruction Manual
ix
Preface: Microcontroller Support Documentation
H The phrase “information on basic operations” refers to online help, an
installation manual, or a basic operations of microcontroller supports user
manual.
H The term “SUT” (system under test) refers to the microcontroller-based
system from which data will be acquired.
H The term “logic analyzer” refers to the Tektronix logic analyzer for which
this product was purchased.
Logic Analyzer Documentation
A description of other documentation available for each type of Tektronix logic
analyzer is located in the corresponding module user manual. The manual set
provides the information necessary to install, operate, maintain, and service the
logic analyzer and associated products.
Contacting Tektronix
Product
Support
Service
Support
For other
information
To write us Tektronix, Inc.
For application-oriented questions about a Tektronix measurement product, call toll free in North America:
1-800-TEK-WIDE (1-800-835-9433 ext. 2400)
6:00 a.m. – 5:00 p.m. Pacific time
Or, contact us by e-mail:
tm_app_supp@tek.com
For product support outside of North America, contact your
local Tektronix distributor or sales office.
Contact your local Tektronix distributor or sales office. Or, visit
our web site for a listing of worldwide service locations.
http://www.tek.com
In North America:
1-800-TEK-WIDE (1-800-835-9433)
An operator will direct your call.
P.O. Box 1000
Wilsonville, OR 97070-1000
x
TMS 143 MCS251 Microcontroller Support Instruction Manual
Getting Started
Getting Started
This chapter contains information on the TMS 143 microcontroller support, and
information on connecting your logic analyzer to your system under test.
Support Description
The TMS 143 microcontroller support package disassembles data from systems
that are based on the Intel MCS251 Family of microprocessors.
The TMS 143 microcontroller support package can acquire and disassemble data
from the TN8XC251SX in a 44-pin PLCC package.
To use this support efficiently, you need to have the items listed in the information on basic operations as well as the 8XC251Sx User’s Manual, Intel.
Logic Analyzer Software Compatibility
To find the version of logic analyzer that this support is compatible with, check
the label of the floppy disk that is supplied with this support.
Logic Analyzer Configuration
For use with a TLA 700 Series the TMS 143 support requires a minimum of
one 68-channel module.
For use with a DAS 9200 Series the TMS 143 support requires a minimum of
one 96-channel module.
Requirements And Restrictions
You should review the general requirements and restrictions of microcontroller
supports in the information on basic operations as they pertain to your SUT.
You should also review electrical, environmental, and mechanical specifications
in the Specifications chapter in this manual as they pertain to your system under
test, as well as the following descriptions of other MCS251 support requirements
and restrictions.
Opcode Fetch/Read Identification. There is no signal that differentiates between an
opcode fetch and a read; therefore:
TMS 143 MCS251 Microcontroller Support Instruction Manual
1–1
Getting Started
H In order for the disassembly to become synchronized, the first fetch cycle is
displayed as a ( MEM READ ), you need to mark it as an “Opcode”.
H In order for the disassembly to become synchronized when the control flow
occurs and there is an address break, the first two bytes are decoded as a
( MEM READ ). Therefore you need to mark the first byte as an “Opcode”.
System Clock Rate. The TMS 143 support can acquire data from the MCS251
microcontroller at speeds of up to 16 MHz
Hardware Reset. If a hardware reset occurs in your MCS251 system during an
acquisition, the disassembler might acquire an invalid sample.
Disabling The Instruction Cache. To disassemble acquired data, you must disable
the internal instruction cache. Disabling the cache makes all instruction
prefetches visible on the bus so that they can be acquired and disassembled.
Functionality Not Supported
Variable WAIT State. The TMS 143 support does not support the variable WAIT
state configuration.
Connecting To A System Under Test
Before you connect to your SUT, you must connect the probes to the module.
Your SUT must also have a minimum amount of clear space surrounding the
microcontroller to accommodate the probe adapter. Refer to the Specifications
chapter in this manual for the required clearances.
1
.
1–2
With A PLCC Probe
Adapter
The general requirements and restrictions of microcontroller supports in the
information on basic operations shows the vertical dimensions of a channel or
clock probe connected to square pins on a circuit board.
To connect your logic analyzer to your SUT using a PLCC probe adapter, follow
these steps:
1. Turn off power to your SUT. It is not necessary to turn off the logic analyzer.
1
Specification at time of printing. Contact your Tektronix sales representative for
current information on the fastest devices supported.
TMS 143 MCS251 Microcontroller Support Instruction Manual
Getting Started
CAUTION. Static discharge can damage the microcontroller, the probe adapter,
the probes, or the module. To prevent static damage, handle all of the above only
in a static-free environment.
Always wear a grounding wrist strap or similar device while handling the
microcontroller and probe adapter.
2. To discharge your stored static electricity, touch the ground connector located
on the back of the logic analyzer. Then, touch any of the ground pins of the
probe adapter to discharge stored static electricity from the probe adapter.
3. Place the probe adapter onto the antistatic shipping foam to support the probe
as shown in Figure 1–1. This prevents the circuit board from flexing.
4. Remove the microcontroller from your SUT.
5. Line up the pin 1 indicator on the microcontroller with pin 1 of the PLCC
socket on the probe adapter.
CAUTION. Failure to correctly place the microcontroller into the probe adapter
may permanently damage electrical components once power is applied.
6. Place the microcontroller into the probe adapter as shown in Figure 1–1.
Microcontroller
Probe adapter
Antistatic Foam
Bevel at both
corners
Figure 1–1: Placing a microcontroller into a PLCC probe adapter
7. Connect the channel and clock probes to the probe adapter as shown in
Figure 1–2. Match the channel groups and numbers on the probe labels to the
corresponding pins on the probe adapter. Match the ground pins on the
probes to the corresponding pins on the probe adapter.
TMS 143 MCS251 Microcontroller Support Instruction Manual
1–3
Getting Started
Channel probe
Antistatic foam
Clock probe
Probe adapter
Figure 1–2: Connecting probes to a PLCC probe adapter
8. Place the probe adapter onto the SUT as shown in Figure 1–3.
Without A Probe Adapter
1–4
Bevel at both corners
SUT socket
Figure 1–3: Placing a PLCC probe adapter onto the SUT
You can use channel probes, clock probes, and leadsets with a commercial test
clip (or adapter) to make connections between the logic analyzer and your SUT.
To connect the probes to MCS251 signals in the SUT using a test clip, follow
these steps:
TMS 143 MCS251 Microcontroller Support Instruction Manual
Getting Started
1. Turn off power to your SUT. It is not necessary to turn off power to the logic
analyzer.
CAUTION. Static discharge can damage the microcontroller, the probes, or the
module. To prevent static damage, handle all of the above only in a static-free
environment.
Always wear a grounding wrist strap or similar device while handling the
microcontroller.
2. To discharge your stored static electricity, touch the ground connector located
on the back of the logic analyzer. If you are using a test clip, touch any of the
ground pins on the clip to discharge stored static electricity from it.
CAUTION. Failure to place the SUT on a horizontal surface before connecting the
test clip might permanently damage the pins on the microcontroller.
Channel Assignments
3. Place the SUT on a horizontal static-free surface.
4. Use Tables 1–1 through 1–2 to connect the channel probes to MCS251 signal
pins on the test clip or in the SUT. Use Table 1–3 to connect the clock probes
and the MCS251 signals.
Use leadsets to connect at least one ground lead from each channel probe and
the ground lead from each clock probe to ground pins on your test clip.
5. Align pin 1 or A1 of your test clip with the corresponding pin 1 or A1 of the
MCS251 microcontroller in your SUT and attach the clip.
The following channel assignment tables show the probe section and channel
assignments, and the signal to which each channel connects.
Channel assignments shown in Table 1–2 through Table 1–3 use the following
conventions:
H All signals are required by the support unless indicated otherwise.
H Channels are shown starting with the most significant bit (MSB) descending
to the least significant bit (LSB).
H Channel group assignments are for all modules unless otherwise noted.
H An tilde asterisk following a signal name indicates an active low signal.
TMS 143 MCS251 Microcontroller Support Instruction Manual
1–5
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