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MOTOROLA
SEMICONDUCTOR TECHNICAL INFORMATION
68HC705E1MSE2
Mask Set Errata 2
68HC705E1 8-Bit Microcontroller Unit
INTRODUCTION
This errata provides address location $1000 data corruption information applicable to
the following 68HC705E1 MCU mask set devices:
•
1D32N
MCU DEVICE MASK SET IDENTIFICATION
The mask set is identified by a four-character code consisting of a letter, two numerical
digits, and a letter (e.g., D32N). Slight variations to the mask set identification code
may result in an optional numerical digit preceding the standard four-character code
(e.g., 1D32N).
MCU DEVICE DATE CODES
Device markings indicate the week of manufacture and the mask set used. The data
is coded as four numerical digits where the first two digits indicate the year and the last
two digits indicate the work week. The date code "9115" would indicate the 15th week
of the year 1991.
MCU DEVICE PART NUMBER PREFIXES
Some MCU samples and devices are marked with an "SC" or "XC" prefix. An "SC"
prefix denotes special/custom device. An "XC" prefix denotes device is tested but is
not fully characterized or qualified over the full range of normal manufacturing process
variations. After full characterization and qualification, devices will be marked with the
"MC" prefix.
Whenever contacting a Motorola representative for assistance, please have the MCU
device mask set and date code information available.
Specifications and information herein are subject to change without notice.
© Motorola, Inc., 1995
DATA CORRUPTION AT ADDRESS LOCATION $1000
When programming the 68HC705E1 MCU device with an external 2764 EPROM
device, data corruption occurs at address location $1000. The data value at address
location $0000 of the EPROM device is programmed at address location $1000 of the
MCU device.
NOTE
When programming the 68HC705E1 MCU, a bootloader circuit
is used to copy the contents of a 2764 EPROM to the MCU
EPROM. A typical bootloader circuit is illustrated in the
MC68HC705E1 Technical Summary,
Motorola document
number MC68HC705E1TS/D.
The MCU device bootloader code causes the data corruption problem. When the
MC14040B 12-bit counter overflows from $FFF to $000, the data is fetched before
address line A12 is pulled high. By the time data is fetched for address $1001,
address line A12 is high and the remainder of the address locations program correctly.
To circumvent the MCU device data corruption problem, the user is advised to
duplicate the data value of the assembled code at address location $1000 and insert
the duplicated value into address location $0000 of the memory device.
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different
applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts.
Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems
intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a
situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold
Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of,
directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the
design or manufacture of the part. Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
Additional mask set erratas can be found on the World Wide Web at http://Design-NET.com/csic/TECHSPRT/TechSprt.htm.
68HC705E1MSE2

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