UM0144 datasheet(43/92 Pages) STMICROELECTRONICS

43 / 92 page

ST7 Assembler Linker

5 OBSEND

UM0144

43/92

The first thing to note is that every thing is in printable ASCII. Eight bit numbers are converted

into two-characters hexadecimal representation.

Each line begins with an ASCII ':' ($3A) character.

The next two characters form a byte that declares how many data bytes follow in the data byte

section little further along. The next four characters form a 16-bit high-byte first number that

specifies the address for the first byte of this data; the rest follows on sequentially.

The next two characters are the record type for this line: 00 is a data line, and 01 signals EOF.

The following characters until the last two are up the 16 data bytes for this line and, the last two

are a checksum for the line, calculated by starting with $00 subtracting the real value of all

characters sent after the ':' until the checksum itself. 'Real value' means that for example, the

two characters 3 and 0 should subtract $30 from the checksum, not 51 and 48. Every line ends

with a CR-LF combination, $0A and $0D.

The last line sent must be an END-OF-FILE line, which is denoted by a line with no data bytes

and a record type of 01 instead of 00.

Giving I32 or i32 instead of intel as the argument uses the same format, but sends 32 bytes of

data per line.

5.2.6

Motorola S-record format

<format>= s

This is another complex method for sending data. Again it cuts the data into 16-byte 'records'

with overhead either sides. S-record come in four types: S0, known as a header record, S1 and

S2 data records with 16 and 24-bit address fields, and S9and S8 EOF records with 16 and 24-

bit address fields.

Note:

The convention is to close a S1 16-bit data record with the S9 16-bit EOF record, and to close a S2 24-bit data record

with the S8 24-bit EOF record.

S10D0010E0006285E000628562856D

record type

number of bytes left, address, data and

checksum (13 in decimal)

0010 address

.... data bytes

checksum

The first two characters define the record type: S0, S1, S2, S8 or S9.

The next two characters form a hexadecimal representation of the numbers of bytes left in the

record (i.e., numbers of characters /2) This count must include the checksum and addresses

bytes that follow. The address field is four characters wide in S0, S1, S9 and six characters

wide in S2 and S8. The most significant character always comes first.

OBSEND will always use S1 type records wherever possible (i.e., when the address is less

than $10000) and use S2 type data records where it has to (i.e., address > $FFFF).

Up to 16 data bytes then follow, with the checksum appended on the end. The checksum is

calculated by starting with $FF and subtracting the 'real value' of all bytes sent from and

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