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Flash Programmer Model TFP2 User’s Manual
2
2 PC USER INTERFACE
2.1 TFP2 CHKSUM.EXE UTILITY
Prior to downloading the target’s hex file to the TFP2, the target’s hex file must be pre-
processed using the CHKSUM.EXE utility provided with the enclosed diskette. A hex file
not processed with CHKSUM.EXE will result in incomplete programming of the target’s
FLASH memory. The target’s code must be of the Extended Intel ASCII HEX-80 format for
processing by CHKSUM.EXE.
From the DOS Command prompt, invoke CHKSUM.EXE as follows:
chksum kb < infile .hex > outfile . hex
where:
kb = desired file size, Memory Size Switch setting to be used during TFP2 downloading and
target programming
infile = target code hex file to be processed
outfile = processed target code hex file to be downloaded to TFP2
The following figure shows a typical invocation of CHKSUM.EXE:
Figure 2-1: CHKSUM.EXE Hex File Processing
The purpose of the CHKSUM utility is to organize the individual hex records into a contiguous “sequential
address increasing” structure. Some compliers produce non-sequential hex files. The TFP2 assumes a
sequential file structure. A non-sequential hex file downloaded to the TFP2 results in missing bytes (the
missing bytes are the out-of-sequence hex records) in the target flash memory (when the target is then
programmed with the TFP2).
The CHKSUM.EXE utility may or may not overwrite the last four bytes of the downloaded target hex file
depending on whether these locations are used or not.
Revision 2.3
7 of 36
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