点阵LED汉字显示系统的汇编程序，看不明白，求高手帮做下注释，谢谢
ORG 0000H
START:MOV R6,#05H
DANZ:LCALL DSUB
DJNZ R6,DANZ
MOV R7,#05H
PIANZ:LCALL PSUB
DJNZ R7,PIANZ
MOV R7,#05H
JIZ:LCALL JSUB
DJNZ R7,JIZ
MOV R7,#05H
ZIZ:LCALL ZSUB
DJNZ R7,ZIZ
AJMP START
DSUB:MOV R5,#00H
MOV R1,#0FEH
DSUB0:MOV DPTR,#0DFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0EFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB1
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB1
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#10H,DSUB0
MOV R1,#0FEH
DSUB1:MOV DPTR,#0EFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0DFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB1
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB1
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#20H,DSUB1
RET
PSUB:MOV R5,#00H
MOV R1,#0FEH
PSUB0:MOV DPTR,#0DFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0EFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB2
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB2
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#10H,PSUB0
MOV R1,#0FEH
PSUB1:MOV DPTR,#0EFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0DFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB2
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB2
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#20H,PSUB1
RET
JSUB:MOV R5,#00H
MOV R1,#0FEH
JSUB0:MOV DPTR,#0DFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0EFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB3
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB3
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#10H,JSUB0
MOV R1,#0FEH
JSUB1:MOV DPTR,#0EFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0DFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB3
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB3
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#20H,JSUB1
RET
ZSUB:MOV R5,#00H
MOV R1,#0FEH
ZSUB0:MOV DPTR,#0DFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0EFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB4
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB4
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#10H,ZSUB0
MOV R1,#0FEH
ZSUB1:MOV DPTR,#0EFFFH
MOV A,R1
MOVX @DPTR,A
MOV DPTR,#0DFFFH
MOV A,#0FFH
MOVX @DPTR,A
MOV DPTR,#TAB4
MOV A,R5
MOVC A,@A+DPTR
MOV DPTR,#7FFFH
MOVX @DPTR,A
INC R5
MOV A,R5
MOV DPTR,#TAB4
MOVC A,@A+DPTR
MOV DPTR,#0BFFFH
MOVX @DPTR,A
LCALL DY1MS
MOV A,R1
RL A
MOV R1,A
INC R5
CJNE R5,#20H,ZSUB1
RET
DY1MS:MOV R3,#20
L1:MOV R4,#50
DJNZ R4,$
DJNZ R3,L1
RET
TAB1:DB 00H,08H,00H,08H,1FH,0E8H,92H,48H
DB 52H,48H,32H,48H,12H,48H,1FH,0FFH
DB 12H,48H,32H,48H,52H,48H,92H,48H
DB 3FH,0C8H,10H,18H,00H,08H,00H,00H
TAB2:DB 00H,01H,00H,02H,7FH,0FCH,04H,80H
DB 04H,80H,04H,80H,04H,80H,04H,80H
DB 0FCH,80H,04H,0FFH,04H,00H,04H,00H
DB 04H,00H,0CH,00H,04H,00H,00H,00H
TAB3:DB 08H,20H,08H,0C0H,0BH,00H,0FFH,0FFH
DB 09H,01H,08H,82H,00H,04H,3FH,0F8H
DB 20H,00H,20H,00H,20H,00H,7FH,0FCH
DB 20H,02H,00H,02H,00H,0EH,00H,00H
TAB4:DB 00H,08H,00H,08H,1FH,0E8H,92H,48H
DB 52H,48H,32H,48H,12H,48H,1FH,0FFH
DB 12H,48H,32H,48H,52H,48H,92H,48H
DB 3FH,0C8H,10H,18H,00H,08H,00H,00H
END
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