如何实时显示系统时间，用汇编语言，我的程序可以显示时间，但是一扫描就是乱码怎么回事

DATAS SEGMENT
YEAR DB 4 DUP (?),2DH
MON DB 2 DUP (?),2DH
DAY DB 2 DUP (?),2CH
HOUR DB 2 DUP (?),3AH
MIN DB 2 DUP (?),3AH
SEC DB 2 DUP (?),0DH,'$' ;此处输入数据段代码
DATAS ENDS
STACKS SEGMENT
;此处输入堆栈段代码
STACKS ENDS
CODES SEGMENT
ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
MOV AX,DATAS
MOV DS,AX

LP1: MOV AH,2AH
INT 21H
H: CMP CX,1000
JAE NEXT
H1: CMP CX,100
JAE NEXT1
H2:CMP CX,10
JAE NEXT2
H3:CMP CX,0
JA NEXT3
JMP JIE
NEXT:SUB CX,1000
INC [YEAR]

JMP H
NEXT1:SUB CX,100
INC [YEAR+1]

JMP H1
NEXT2:SUB CX,10
INC [YEAR+2]
JMP H2
NEXT3:SUB CX,1
INC [YEAR+3]
JMP H3
JIE:HLT
ADD [YEAR],30H
ADD [YEAR+1],30H
ADD [YEAR+2],30H
ADD [YEAR+3],30H
U: CMP DH,10
JAE M
U1: CMP DH,0
JA M1
JMP GUO
M:SUB DH,10
INC [MON]
JMP U
M1:SUB DH,1
INC [MON+1]
JMP U1
GUO:HLT
ADD [MON],30H
ADD [MON+1],30H
N: CMP DL,10
JAE D
N1: CMP DL,0
JA D1
JMP G
D:SUB DL,10
INC [DAY]
JMP N
D1:SUB DL,1
INC [DAY+1]
JMP N1
G:HLT
ADD [DAY],30H
ADD [DAY+1],30H

MOV AH,2CH
INT 21H
T: CMP CH,10
JAE Y
T1:CMP CH,0
JA Y1
JMP Q
Y:SUB CH,10
INC [HOUR]
JMP T
Y1:SUB CH,1
INC [HOUR+1]
JMP T1
Q:HLT
ADD [HOUR],30H
ADD [HOUR+1],30H

MI: CMP CL,10
JAE MI1
MI3: CMP CL,0
JA MI2
JMP M4
MI1:SUB CL,10
INC [MIN]
JMP MI
MI2:SUB CL,1
INC [MIN+1]
JMP MI3
M4:HLT
ADD [MIN],30H
ADD [MIN+1],30H

SE: CMP DH,10
JAE SE1
SE3: CMP DH,0
JA SE2
JMP SE4
SE1:SUB DH,10
INC [SEC]
JMP SE
SE2:SUB DH,1
INC [SEC+1]
JMP SE3
SE4:HLT
ADD [SEC],30H
ADD [SEC+1],30H

MOV AX,DATAS
MOV DS,AX
LEA DX,YEAR
MOV AH,09H
INT 21H
MOV AH,0BH
INT 21H
CMP AL,01H
JZ EXIT
JMP LP1
;此处输入代码段代码
EXIT: MOV AH,4CH
INT 21H
CODES ENDS
END START