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dsPIC30F Flash Programming Specification

DS70102K-page 62

2010 Microchip Technology Inc.

APPENDIX B: HEX FILE FORMAT

Flash programmers process the standard HEX format

used by the Microchip development tools. The format

supported is the Intel HEX 32 Format (INHX32).

Please refer to Appendix A in the “MPASM User’s

Guide” (DS33014) for more information about hex file

formats.

The basic format of the hex file is:

:BBAAAATTHHHH...HHHHCC

Each data record begins with a 9-character prefix and

always ends with a 2-character checksum. All records

begin with ‘:’ regardless of the format. The individual

elements are described below.

BB - is a two-digit hexadecimal byte count

representing the number of data bytes that appear

on the line. Divide this number by two to get the

number of words per line.

AAAA - is a four-digit hexadecimal address

representing the starting address of the data

record. Format is high byte first followed by low

byte. The address is doubled because this format

only supports 8-bits. Divide the value by two to

find the real device address.

TT - is a two-digit record type that will be ‘00’ for

data records, ‘01’ for end-of-file records and ‘04’

for extended-address record.

HHHH - is a four-digit hexadecimal data word. For-

mat is low byte followed by high byte. There will

be BB/2 data words following TT.

CC - is a two-digit hexadecimal checksum that is

the two’s complement of the sum of all the

preceding bytes in the line record.

Because the Intel hex file format is byte-oriented, and

the 16-bit program counter is not, program memory

sections require special treatment. Each 24-bit

program word is extended to 32 bits by inserting a so-

called “phantom byte”. Each program memory address

is multiplied by 2 to yield a byte address.

As an example, a section that is located at 0x100 in

program memory will be represented in the hex file as

0x200.

The hex file will be produced with the following con-

tents:

:020000040000fa

:040200003322110096

:00000001FF

Notice that the data record (line 2) has a load address

of 0200, while the source code specified address

0x100. Note also that the data is represented in “little-

endian” format, meaning the Least Significant Byte

(LSB) appears first. The phantom byte appears last,

just before the checksum.

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