Motorola M68CPU32BUG Manuale Utente Scaricare il pdf (Pagina 13)

Step 5: Add the values of the bytes of each block and append the one’s complement of

the least two signiﬁcant bytes of the sum to the right side of the block:

09 40 00 20 3C 00 00 12 34 14

05 40 06 22 00 92

Step 6: complete the s-record with the header record, the header types and the termina-

tion records:

S0 10 00 00 47 4F 20 48 41 42 53 20 47 4F 21 20 20 04

S1 09 40 00 20 3C 00 00 12 34 14

S1 05 40 06 22 00 92

S9 03 00 00 FC

Comment: The header and termination records are the ﬁrst and last line in the above list-

ing of step 6. Details about the format of these records can be found in Appendix 3.

Part 3: Downloading to the board.

Download your S-record ﬁle to the board. More details on how to download a ﬁle to the

board can be found in the ﬁrst experiment.

Part 4: Contrast with assembler output

Assemble the program using the MC68332 assembler to obtain the listing and the S-

record ﬁles.

Once the listing and the S-record ﬁles are obtained, compare them with your hand gener-

ated ﬁles.

Part 5: Run the program.

Single step execute your program and observe the results.

QUESTIONS

1. What does the given assembly program do?

2. What is the purpose of the “checksum” ﬁeld in the s-record format?

3. Why is it possible to have many different S-record ﬁles for a given assembly program?

4. Elaborate on the tasks of an assembler and a loader program.

5. In the given S0 record ( Step 6 of Part 2), what is the ASCII string represented by the

13 bytes appearing after the 2 byte address ﬁled of 00 00?

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 34 35

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Motorola M68CPU32BUG Manuale Utente Pagina 13