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Homework help

Jake Young

Question: Write a program to copy 10 bytes of data at ROM address 500H to RAM starting at
location 40H. Start with creating a look-up table at a convenient location

ORG 500H
TABLE: DB 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

ORG 40H
START: MOV DPTR, #TABLE ;SOURCE POINTER
MOV R1, #40H ;DESTINATION POINTER
MOV R3, #10 ;COUNTER

BACK: MOVC A, @A+DPTR ;GET A BYTE FROM THE SOURCE
MOV @R1, A
INC R1
INC DPTR
DJNZ R3, BACK ;Does this 10 times
END

This is what I have but I have no idea if it is right or working correctly. Can anyone help me out?

Parents
  • 0 in reply to Jake Young

    So do the paper & pencil exercise to map out what you think should be happening.

    Cross-check what you think the instructions do with the descriptions in the Instruction Set Manual.

    Then run you code in the Simulator; see where the simulator results differ from your paper & pencil results - then go back to the Instruction Set Manual; re-read and understand the instructions ...

    Always question what your teachers say if it is vague!

Reply
  • 0 in reply to Jake Young

    So do the paper & pencil exercise to map out what you think should be happening.

    Cross-check what you think the instructions do with the descriptions in the Instruction Set Manual.

    Then run you code in the Simulator; see where the simulator results differ from your paper & pencil results - then go back to the Instruction Set Manual; re-read and understand the instructions ...

    Always question what your teachers say if it is vague!

Children
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