org 0000h
ljmp main
org 0023h
ljmp sbr1
org 0030h
main:mov sp,#60h
mov tmod,#20h
mov tl1,#0fdh
mov th1,#0fdh
setb tr1
mov scon,#50h
mov r1,#03h
mov 20h,#50h
mov 21h,#5Ah
mov 22h,#24h
mov r0,#20h
setb es
setb ea
lcall stx
sjmp $
sbr1:jnb ri, sen
acall led
sjmp next
sen:acall stx
next:reti
stx:clr ti
mov a,@r0
mov sbuf,a
inc r0
djnz r1,send
mov r1,#03h
mov r0,#20h
send:ret
led:clr ri
mov a,sbuf
mov p1,a
ret
end
谁能说明下每步的作用
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