The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

EXPLAINING INTEL HEX

FILE(cont’)

Example 8-4Verify the checksum byte for line 3 of Figure 8-9. Verify also that the information is not corrupted.Solution::07 0020 00 DBFEDCFADDF622

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07+00+20+00+DB+FE+DC+FA+DD+F6+22=5CBH

CBH 35H

If we add all the information including the checksum byte, and drop the carries, we get 00.5CBH + 35H = 600H

Dropping the carry 52’s complement

:07 0020 00 DBFEDCFADDF622

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