MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 641

• Manufacturer Part Number: MC68EC000EI20
• Description: IC MPU 32BIT 20MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI20

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

APPENDIX C
S-RECORD OUTPUT FORMAT
The S-record format for output modules is for encoding programs or data files in a printable
format for transportation between computer systems. The transportation process can be
visually monitored, and the S-records can be easily edited.
C.1 S-RECORD CONTENT
Visually, S-records are essentially character strings made of several fields that identify the
record type, record length, memory address, code/data, and checksum. Each byte of binary
data encodes as a two- character hexadecimal number: the first character represents the
high- order four bits, and the second character represents the low-order four bits of the byte.
Figure C-1 illustrates the five fields that comprise an S-record. Table C-1 lists the composi-
tion of each S- record field.
MOTOROLA
Type
Record Length
Address
Code/Data
Checksum
TYPE
Field
MC68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
RECORD LENGTH
Table C-1. Field Composition of an S-Record
Characters
Printable
4, 6, or 8
Figure C-1. Five Fields of an S-Record
0–2n
2
2
2
Contents
S-record type—S0, S1, etc.
The count of the character pairs in the record, excluding the type
and record length.
The 2-, 3-, or 4-byte address at which the data field is to be loaded
into memory.
From 0 to n bytes of executable code, memory loadable data, or
descriptive information. For compatibility with teletypewriters,
some programs may limit the number of bytes to as few as 28 (56
printable characters in the S-record).
The least significant byte of the one’s complement of the sum of
the values represented by the pairs of characters making up the
record length, address, and the code/data fields.
ADDRESS
CODE/DATA
CHECKSUM
C-1