Motorola M68CPU32BUG Manuel d'utilisateur télécharger pdf (Page 66)

APPENDIX A

M68332BCC/D A-2 MOTOROLA

REV 1

Each record may be terminated with a CR/LF/NULL. Additionally, an S-record may have an

initial field to accommodate other data such as line numbers generated by some time-sharing

systems. An S-record file is a normal ASCII text file in the operating system of origin.

Accuracy of transmission is ensured by the record length (byte count) and checksum fields.

S-RECORD TYPES

Eight types of S-records have been defined to accommodate the several needs of the encoding,

transportation and decoding functions. The various Motorola upload, download and other

records transportation control programs, as well as cross assemblers, linkers and other file-

creating or debugging programs, utilize only those S-records which serve the purpose of the

program. For specific information on which S-records are supported by a particular program, the

user’s manual for the program must be consulted. 332Bug supports S0, S1, S2, S3, S7, S8, and

S9 records.

An S-record format module may contain S-records of the following types:

Type Description

S0 The header record for each block of S-records, The code/data.field may contain any descriptive

information identifying the following block of S-records. The address field is normally zeros.

S1 A record containing code/data and the 2-byte address at which the code/data is to reside.

S2 A record containing code/data and the 3-byte address at which the code/data is to reside.

S3 A record containing code/data and the 4-byte address at which the code/data is to reside.

S5 A record containing the number of S1, S2, and S3 records transmitted in a particular block. This

count appears in the address field. There is no code/data field.

S7 A termination record for a block of S3 records, The address field may optionally contain the 4-

byte address of the instruction to which control is passed. There is no code/data field.

S8 A termination record for a block of S2 records. The address field may optionally contain the 3-

byte address of the instruction to which control is passed. There is no code/data field.

S9 A termination record for a block of S1 records. The address field may optionally contain the 2-

byte address of the instruction to which control is passed. If not specified, the first entry point

specification encountered in the object module input will be used. There is no code/data field.

Only one termination record is used for each block of S-records. S7 and S8 records are usually

used only when control is to be passed to a 3 or 4 byte address. Normally, only one header

record is used, although it is possible for multiple header records to occur.

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Motorola M68CPU32BUG Manuel d'utilisateur Page 66