a.asm

40个练习程序（坚持）.rar

org 0000h
ajmp main
org 000bh
ajmp start
org 0030h
main:
mov tmod,#00h
mov tl0,#00h
mov th0,#00h
setb ea
setb et0
setb tr0
mov r0,#00h
mov r1,#00h
mov r7,#100
ww:mov dptr,#tab
mov p2,#01h
mov a,r0
movc a,@a+dptr
mov p0,a
lcall delay
cjne r0,#10,n1
mov r0,#00h
inc r1
cjne r1,#10,n1
mov r1,#00h
n1:mov a,r1
mov p2,#00h
movc a,@a+dptr
mov p0,a
lcall delay
ajmp ww
start:
mov tl0,#00h
mov th0,#00h
djnz r7,re
mov r7,#100
clr tr0
mov tl0,#00h
mov th0,#00h
inc r0
re:setb tr0
reti
delay:mov r6,#10
se:mov r5,#100
djnz r5,$
djnz r6,se
ret
tab:db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h
db 7fh,6fh
end

;在没加数码管延时（DELAY）时，数码管看不清，只有两位数字相同时才清楚，
；；可能是由于对数码管的扫描频率太大所致