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S-Record Format
S-Record Types
Table A.1 Description of S-Record Fields
Field
Address
Code/Data
Checksum
Printable
Characters
4, 6, or 8
0-2n
2
Contents
2-, 3-, or 4-byte address at which the data
field is to be loaded into memory
From 0 to n bytes of executable code,
memory loadable data, or descriptive
information. For compatibility with
teletypewriter, some programs may limit the
number of bytes to as few as 28 (56
printable characters in the S-record)
Least significant byte of the one’s
complement of the sum of the values
represented by the pairs of characters
making up the record length, address, and
the code/data fields
The format specifies that each byte of binary data must be encoded as a two-character
hexadecimal number:
? the first character represents the high-order four bits
? the second character represents the low-order four bits of the byte
Each record may be terminated with a CR/LF/NULL. Additionally, an S-record may have
an initial field to accommodate other data such as line numbers generated by a time-
sharing system.
The record length (byte count) and checksum fields help to verify whether the S-record is
transmitted accurately.
S-Record Types
Eight types of S-records have been defined to accommodate the several needs of the
encoding, transportation, and decoding functions. Table A.2 describes the different types.
The various upload, download, and other record transportation control commands, as well
as cross assemblers, linkers, and other file-creating or debugging tools, use only those S-
records which serve the purpose of the tool.
For specific information on which S-records are supported by a particular tool, the user
manual for that program must be consulted.
Freescale In-Circuit Emulator Base User Manual, Rev. 1.1
76
Freescale Semiconductor
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