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[NETIMPRESS common] Specification of Intel HEX format

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<Intel HEX Records example>

:02000004CAFE32
:1001000055AA55AA55AA55AA55AA55AA55AA55AAF7
:10011000000102030405060708090A0B0C0D0E0F67
:100120000AA55AA55AA55AA55AA55AA55AA55AA55D7
:1001300000000000000000000000000000000000BF
:1001400055AA55AA55AA55AA55AA55AA55AA55AAB7
:10015000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFAF
:00000001FF

 

<Intel HEX Record structure>

①Record Mark ":" (1character)
②Data Length (1 byte/2 characters)
③Offset Address (16 bits/4 characters)
④Record Type (2 characters)
⑤Data (n bytes/2n characters)
⑥Checksum (1 byte/2 characters)

 

① In the Intel HEX format, the first character is always ":".

② Data Length: Indicates the number of data points (in bytes) stored in the data field
    using two characters.

    Note that, unlike Motorola S-records, this is the data length recorded in the data record.

③Offset Address: For data records, this specifies the address where the first byte
   is stored,   using 16 bits (4 characters). For other record types, this is usually "0000".


④Record type

00Data Record:
A data field represents 1 byte of data using 2 characters.
01End Record:
Indicates the end of the HEX file. Since there are no data fields, the data length field will be "00".
02Extended Segmant Address Record (ESA):
This is a record that provides a 20-bit offset to data records. Since object records were originally created to extend 16-bit addresses to 20-bit addresses, formats using this are sometimes called Extended IntelHEX format.
03Start Segment Address Record:
Used to specify the execution start address when downloading and using a program.
The value of the record's data (16 bits) is shifted 4 bits to the left.
(This record is not usually used in programmer.)
04

Extended Linear Address Record(ELA)：
Since the segment address record format can only represent addresses up to 20 bits, this format was added when 32-bit addresses became necessary. This record provides the upper 16 bits of the 32-bit address. (The lower 16 bits use the value of the offset field in the data record.)

Example:
:0A0200004E4554494D5052455353EA
　if such a data record exists, it will be stored starting from address 0200H,
:02000004E0100A
　If this record exists, it will be stored starting from address E0100200H.

05

Start Linear Address：
The start segment address record can only specify a range of 20 bits. The start linear address record extends this to allow for 32-bit representation.
(Data length: 4 bytes; similar to the start segment address record, it is not typically used in programmer.)

Example:
:04000005FF000123D4
If this is the case, then address FF000123h will be the starting address.

 

⑤Data: Two characters represent one byte of data.


⑥Checksum: 2-character (1-byte) data. It is the two's complement of the sum of the byte values ​​in the record length, data length field, offset address field, and data field.

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