微處理機(8051)上機考古題 data move-1-4

4.Move data from external code RAM 1234H-1285H to on-chip SRAM 22H -73H. You can use following instructions to initialize code memory :
ORG 1234H
TABLE: DB 03, 56H, 01H,……
(2009.12.31.PM.01:12將程式碼補上)

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HINT:
(1.)external code RAM=ROM
(2)
ORG 1234H
TABLE: DB 03, 56H, 01H,……
這段為是寫入數值在ROM中

程式碼如下:

org 1234H
db 03,56H,01H

org 0H
source equ 1234H
dest equ 22H
time_num equ 30H

mov r0,#dest
mov time_num,#51H

mov dptr,#source
L1:
clr a
movc a,@a+dptr
mov @r0,a
inc dptr
inc r0
djnz time_num,L1
nop

end

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