謝謝各位先進的回答...我寫的程式大致如下，現在我遇到一個問題就是，我旗標只能送出一次....
org 0000h
acall boud
mov scon,#70h ;set series port mode1
;-------------------------------
loop1: clr ti
mov sbuf,#'1'
jnb ti,$
ajmp main
;-------------------------------------
main: clr p1.7 ;start a/d converter
mov p1,#00000000b
setb p1.7 ;
wait: jb p1.6,wait ;wait transform complate
mov a,p2 ;put (port2_data) to reg_A
mov r0,a ;put A to r0
;-------------------------------
clr ti ;ready to transmite data
mov sbuf,r0 ;
wait1: jnb ti,wait1 ;waitting for data transmite ok
acall delay ;
ajmp loop2 ;transmite new Port2_data continue ;---------------------------------------------
loop2: clr ti
mov sbuf,#'2'
jnb ti,$
ajmp main1
;--------------------------------
main1: clr p1.7 ;start a/d converter
cpl p1.4
setb p1.7 ;
wait2: jb p1.6,wait2 ;wait transform complate
mov a,p2 ;put (port2_data) to reg_A
mov r0,a ;put A to r0
;-------------------------------
clr ti ;ready to transmite data
mov sbuf,r0 ;
wait3: jnb ti,wait3 ;waitting for data transmite ok
acall delay ;
ajmp loop3 ;transmite new Port2_data continue ;-------------------------------
loop3: clr ti
mov sbuf,#'3'
jnb ti,$
ajmp main2
;---------
main2: clr p1.7 ;start a/d converter
cpl p1.5
setb p1.7 ;
wait4: jb p1.6,wait ;wait transform complate
mov a,p2 ;put (port2_data) to reg_A
mov r0,a ;put A to r0
;-------------------------------
clr ti ;ready to transmite data
mov sbuf,r0 ;
wait5: jnb ti,wait1 ;waitting for data transmite ok
acall delay ;
ajmp loop1 ;transmite new Port2_data continue
;-------------------------------
boud: mov tmod,#20h ;work mode2
mov th1,#FDH ;boudrate=9600 bps
mov tl1,#FDH
setb tr1 ;start timmer1
ret
;------------------------------
delay: mov r7,#200 ;
aa: mov r6,#200
bb: djnz r6,bb
djnz r7,aa
ret
end
在電腦端接到的資料，收到資料大致如下：50,2,51,50,6,51,......
50和51是旗標"2"和"3"，我想請問一下49也就是旗標"1"不見了.....真傷腦經也..... P.S:po程式碼,請加code指令. 發表人 - ㊣ 於 2005/07/06 17:44:21
發表時間：2005-07-06 00:15:35
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