下面是怎么网上帖子，是信号发生器的一种程序，请哪位熟悉的朋友给标注一下，我还是有些看不懂，只不过有个语法错误我可以看出来
是MOV R6,R3
MOV R7,R4
我全部修改成
MOV A，R3
MOV R6，A
MOV A，R4
MOV R7，A
仿真运行，P1。0 确实可以产生方波，但是调节是怎么原理，看不出来，请高手给参谋一下。谢谢了。
;方波信号发生器
;98周志明
;频率范围0.09Hz-99.9KHz
ORG 0
SJMP MAIN
ORG 000BH
LJMP PTF0
MAIN: MOV SP,#06FH
MOV 50H,#0 ;计算用
MOV 51H,#0 ;有效数字1
MOV 52H,#01h
MOV 53H,#0
MOV 54H,#0 ;*1倍率
MOV A,54H
CJNE A,#0,ZZM1
ZZM0: MOV A,51H
CJNE A,#0,ZZM01
MOV A,52H
CJNE A,#0,ZZM02
MOV R0,#111
MOV R1,#1
MOV TL0,#0B0H
MOV TH0,#3CH
LJMP TIMES
ZZM02: MOV 51H,52H
MOV 52H,53H
MOV 53H,#0
LCALL IDTB
LCALL YY
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#50
MOV R1,#10
LJMP TIMES
ZZM01: LCALL IDTB
LCALL YY
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#50
MOV R1,#1
LJMP TIMES
ZZM1: MOV A,54H
CJNE A,#01H,ZZM2
MOV A,51H
CJNE A,#0,ZZM11
MOV A,52H
CJNE A,#0,ZZM12
MOV 51H,53H
MOV 53H,#0
LCALL IDTB
LCALL YY
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#50
MOV R1,#10
LJMP TIMES
ZZM12: MOV 51H,52H
MOV 52H,53H
MOV 53H,#0
LCALL IDTB
LCALL YY
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#50
MOV R1,#1
LJMP TIMES
ZZM11: LCALL IDTB
LCALL YY
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#5
MOV R1,#1
LJMP TIMES
ZZM2: MOV A,54H
CJNE A,#02H,ZZM3
MOV A,51H
CJNE A,#0,ZZM21
MOV A,52H
CJNE A,#0,ZZM22
MOV 51H,53H
MOV 53H,#0
LCALL IDTB
LCALL YY
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#50
MOV R1,#1
LJMP TIMES
ZZM22: MOV 51H,52H
MOV 52H,53H
MOV 53H,#0
LCALL IDTB
LCALL YY
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#5
MOV R1,#1
LJMP TIMES
ZZM21: LCALL IDTB
MOV R6,R3
MOV R7,R4
MOV R2,#0
MOV R3,#07H
MOV R4,#0A1H
MOV R5,#20H
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#1
MOV R1,#1
LJMP TIMES
ZZM3: MOV A,54H
CJNE A,#03H,ZZM4
MOV A,51H
CJNE A,#0,ZZM31
MOV A,52H
CJNE A,#0,ZZM32
MOV 52H,53H
MOV 53H,#0
LCALL IDTB
LCALL Z
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#5
MOV R1,#1
LJMP TIMES
ZZM32: LCALL IDTB
MOV R6,R3
MOV R7,R4
MOV R2,#0
MOV R3,#0
MOV R4,#0C3H
MOV R5,#50H
LCALL NDIV1
AAAA: MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#1
MOV R1,#1
LJMP TIMES
ZZM31: LCALL IDTB
MOV R6,R3
MOV R7,R4
MOV R2,#0
MOV R3,#0
MOV R4,#0c3H
MOV R5,#50H
LCALL NDIV1
SJMP AAAA
ZZM4: LCALL IDTB
MOV R6,R3
MOV R7,R4
MOV R2,#0
MOV R3,#0
MOV R4,#13H
MOV R5,#88H
LCALL NDIV1
MOV A,#0FFH
SUBB A,R5
MOV TL0,A
MOV A,#0FFH
SUBB A,R4
MOV TH0,A
MOV R0,#1
MOV R1,#1
LJMP TIMES
IDTB: MOV R0,#50H
MOV R2,#3
MOV R3,#0
MOV A,@R0
MOV R4,A
LOOP: MOV A,R4
MOV B,#10
MUL AB
MOV R4,A
MOV A,B
XCH A,R3
MOV B,#10
MUL AB
ADD A,R3
MOV R3,A
INC R0
MOV A,R4
ADD A,@R0
MOV R4,A
MOV A,R3
ADDC A,#0
MOV R3,A
DJNZ R2,LOOP
RET
YY: MOV R6,R3
MOV R7,R4
MOV R2,#0
MOV R3,#0FH
MOV R4,#42H
MOV R5,#40H
RET
Z: MOV R6,R3
MOV R7,R4
MOV R2,#0
MOV R3,#01H
MOV R4,#86H
MOV R5,#0A0H
RET
NDIV1: MOV A,R3
CLR A
SUBB A,R7
MOV A,R2
SUBB A,R6
JNC NDVE1
MOV B,#16
NDVL1: CLR C
MOV A,R5
RLC A
MOV R5,A
MOV A,R4
RLC A
MOV R4,A
MOV A,R3
RLC A
MOV R3,A
XCH A,R2
RLC A
XCH A,R2
MOV F0,C
CLR C
SUBB A,R7
MOV R1,A
MOV A,R2
SUBB A,R6
JB F0,NDVM1
JC NDVD1
NDVM1: MOV R2,A
MOV A,R1
MOV R3,A
INC R5
NDVD1: DJNZ B,NDVL1
CLR F0
RET
NDVE1: SETB F0
RET
TIMES: MOV TMOD,#1
MOV IP,#2
MOV IE,#82H
MOV 30H,TL0
MOV 31H,TH0
MOV 32H,R0
MOV 33H,R1
SETB P1.0
SETB TR0
AAA: SJMP AAA
PTF0: DJNZ R0,PTF1
MOV R0,32H
DJNZ R1,PTF1
CPL P1.0
MOV R1,33H
ptf1: mov a,30h
orl tl0,a
mov th0,31h
PTF0R: RETI
END
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