c51单片机无反应
请各位大大赐教。这是我们微机课程的单片机代码，用单片机向外发指令码，指令码很少所以就直接置入地址了。程序在keil上仿真的时候通过模拟串口输出没有问题，但是烧到开发板上后串口完全没有反应，已经排除开发板的故障。请各位大大赐教！
org 0000h
ljmp main
org 0200h
main:
mov TMOD,#20h
mov r0,#40h
mov 60h,#30h ; 0
mov 61h,#31h ; 1
mov 62h,#35h ; 5
mov 63h,#0dh ; 0d and 0a are stop bits
mov 64h,#0ah
mov 65h,#41h ; A
mov 66h,#54h ; T
mov 67h,#5Ah ; Z
mov sp,#60h
mov scon,#50H
mov pcon,#80h
mov tl1,#0fah
mov th1,#0fah
setb tr1
mov p3,#11111111b
choose:
mov r0,#40h
mov 60h,#30h ; 0
mov 61h,#31h ; 1
mov 62h,#35h ; 5
mov 63h,#0dh ; 0d and 0a are stop bits
mov 64h,#0ah
mov 65h,#41h ; A
mov 66h,#54h ; T
mov 67h,#5Ah ; Z
jnb p3.0,jump1
jump1:
jnb p3.4,fuwei
jnb p3.5,again
sjmp choose
fuwei:
mov a,65h
mov sbuf,a
jnb ti,$
clr ti
mov a,66h
mov sbuf,a
jnb ti,$
clr ti
mov a,67h
mov sbuf,a
jnb ti,$
clr ti
mov a,63h
mov sbuf,a
jnb ti,$
clr ti
mov a,64h
mov sbuf,a
jnb ti,$
clr ti
againfuwei:jnb ri,$
clr ri
mov a,sbuf
cjne a,#0Ah,againfuwei
ljmp choose
again:
mov a,60h
mov sbuf,a
jnb ti,$
clr ti
mov a,61h
mov sbuf,a
jnb ti,$
clr ti
mov a,60h
mov sbuf,a
jnb ti,$
clr ti
mov a,62h
mov sbuf,a
jnb ti,$
clr ti
mov a,63h
mov sbuf,a
jnb ti,$
clr ti
mov a,64h
mov sbuf,a
jnb ti,$
clr ti
again1:jnb ri,$
clr ri
mov a,sbuf
mov @r0,a
inc r0
cjne a,#0Ah,again1
mov a,46h
cjne A,#40h,L1
L1:jc L2
clr c
subb a,#37h
mov 46h,a
second:
mov a,47h
cjne A,#40h,L3
L3:jc L4
clr c
subb a,#37h
mov 47h,a
third:
mov a,49h
cjne A,#40h,L5
L5:jc L6
clr c
subb a,#37h
mov 49h,a
fourth:
mov a,4Ah
cjne A,#40h,L7
L7:jc L8
clr c
subb a,#37h
mov 4Ah,a
ljmp paixu
L2:clr c
subb a,#30h
mov 46h,a
ljmp second
L4:clr c
subb a,#30h
mov 47h,a
ljmp third
L6:clr c
subb a,#30h
mov 49h,a
ljmp fourth
L8:clr c
subb a,#30h
mov 4Ah,a
ljmp paixu
paixu:
clr c
mov a,46h
rlc a
rlc a
rlc a
rlc a
add a,47h
mov 46h,a; gaowei
clr c
mov a,49h
rlc a
rlc a
rlc a
rlc a
add a,4Ah
mov 47h,a; diwei
clr c
mov a,46h
rrc a
mov 50h,a
mov a,47h
rrc a
mov 51h,a
clr c
mov a,50h
rrc a
mov 50h,a
mov a,51h
rrc a
mov 51h,a
mov th1,50h ;high
mov tl1,51h
MOV R0, TH1
MOV R1, TL1
CALL HEX2BCD ;
HEX2BCD:
CLR A
MOV R2, A ;?
MOV R3, A
MOV R4, A
MOV R5, #16 ;?
LOOP:
CLR C
MOV A, R1 ;?Cy
RLC A
MOV R1, A
MOV A, R0
RLC A
MOV R0, A
MOV A, R4 ;?BCD?
ADDC A, R4 ;?,?
DA A ;?,?BCD?
MOV R4, A
MOV A, R3
ADDC A, R3
DA A
MOV R3, A
MOV A, R2
ADDC A, R2
MOV R2, A
DJNZ R5, LOOP ;?
mov 44h,r4 ;shi ge
mov 43h,r3 ;qian bai
mov 42h,r2 ;wan
mov 41h,r1
mov 40h,r0
ljmp choose
end
怨不得没人答复呢，好久不看汇编语言了！
我就来看看 。
小编你还是晒C程序吧 汇编高手不多呀