微處理機(8051)上機考古題 Arithmetic 2-9

9.Write a program to change a 2-byte BCD stored in 20H-21H into a 16-bit unsigned number at 30H-31H. For example, if (20H)=38H, (21H)=59H, then (30H)=0FH, (31H)=13H.(09.12.31.PM12:54最後更新)(10.01.03PM12:10做程式碼修正)

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PS:

因題目是3859H

原程式碼只用3859來做

所以此次更新為把3859H做轉換變成3859

程式碼如下:

source_dph equ 20H
source_dpl equ 21H
dest_dph equ 30H
dest_dpl equ 31H

mov source_dph,#38H
mov source_dpl,#59H

mov a,source_dph
mov b,#10H
div ab
mov 40h,b
mov b,#10
mul ab
add a,40h
mov r0,a

mov a,source_dpl
mov b,#10H
div ab
mov 40h,b
mov b,#10
mul ab
add a,40h
mov r1,a

mov a,r0
mov b,#100
mul ab
mov r0,b

add a,r1
mov dest_dpl,a
mov a,r0
addc a,#0
mov dest_dph,a

nop
end

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