Filter
Top Products
Chapter 9 – Firmware Upgrade Procedure
SocketModem Global MT5634SMI Developer’s Guide 74
Intel Hex Format
An Intel Format Hex File is a text file consisting of “records”, one per line, that start with a “:” character and
include only digits 0-9 and letters A-F. There are three different record types: Extended Address Records, Data
Records, and End of File Records.
Data records contain the actual data that is to be programmed into a device. The address contained in the data
record needs to be combined with an extended address (by adding the extended address shifted four bits left to
the data record address) to determine the actual programming address for the data. If no extended address
record is before a given data record in the file, then the extended address value is assumed to be zero.
The record types are described below:
Data Record
Char Pos Field Type Value Description
1 Record Start “:”
2-3 Data Byte Count “NN” Maximum value is FF (which is 255 data bytes).
Typical is 20h which causes the hex record to fit
in 80 columns.
4-7 Address “XXXX” Lower 16 bits of 20 bit address, most significant
byte first. This must be added to Extended
Address left shifted four bits.
8-9 Record Type “00” Data Record
10+N Data Bytes “YY..YY” The data bytes in hex. Each byte is two
characters.
NN+1,2 Checksum “ZZ” Zero minus the two’s complement addition of all
data hex values.
NN+3,4 End of Line “\r\n” Carriage Return followed by a Line Feed
Example Data Record in Intel Format
:2000A0005BB66DDBB66CD8B060C183060D1B366DDBB66DDBB76FDFBF7EFDFBF6EDDBB66DD4
Extended Address Record
Char Pos Field Type Value Description
1 Record Start “:”
2-3 Data Byte Count “02” Always 2 bytes for this record type
4-7 Address “0000” Not used for this record type (must be zero)
8-9 Record Type “02” Extended Address Record
10-13 Extended Address “EEEE” Top 16 bits of 20 bit address, most significant
byte first
14-15 Checksum “ZZ” Zero minus the two’s complement addition of all
data hex values
16-17 End of Line “\r\n” Carriage Return followed by a Line Feed
Example Extended Address Record in Intel Format
:020000021000EC
End of File Record
Char Pos Field Type Value Description
1 Record Start “:”