A51 MACRO ASSEMBLER  PWM                                                                  08/03/2006 11:16:36 PAGE     1


MACRO ASSEMBLER A51 V8.00
OBJECT MODULE PLACED IN PWM.OBJ
ASSEMBLER INVOKED BY: e:\Program Files\Keil\C51\BIN\A51.EXE PWM.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

  0035                 1     ADC             EQU             35H
  00A4                 2     CLOCK   BIT             P2.4                    ;定義ADC0808時(shí)鐘位
  00A5                 3     ST              BIT     P2.5
  00A6                 4     EOC     BIT     P2.6
  00A7                 5     OE              BIT     P2.7
  00B7                 6     PWM             BIT             P3.7
0000                   7                     ORG     00H
0000 800C              8                     SJMP    START
000B                   9                     ORG             0BH
000B 02003E           10                     LJMP    INT_T0
                      11     
000E 758902           12     START:  MOV             TMOD,#02H
0011 758C14           13                     MOV             TH0,#20
0014 758A00           14                     MOV             TL0,#00H
0017 75A882           15                     MOV             IE,#82H
001A D28C             16                     SETB    TR0
                      17     
001C C2A5             18     WAIT:   CLR     ST                              
001E D2A5             19                     SETB    ST
0020 C2A5             20                     CLR     ST                              ;啟動(dòng)AD轉(zhuǎn)換
0022 30A6FD           21                     JNB     EOC,$                   ;等待轉(zhuǎn)換結(jié)束
0025 D2A7             22                     SETB    OE 
0027 859035           23                     MOV     ADC,P1                  ;讀取AD轉(zhuǎn)換結(jié)果
002A C2A7             24                     CLR     OE
002C D2B7             25                     SETB    PWM             
002E E535             26                     MOV     A,ADC
0030 120041           27                     LCALL   DELAY
0033 C2B7             28                     CLR             PWM
0035 74FF             29                     MOV             A,#255
0037 9535             30                     SUBB            A,ADC
0039 120041           31                     LCALL   DELAY
003C 80DE             32                     SJMP    WAIT
                      33     
003E B2A4             34     INT_T0: CPL             CLOCK                   ;提供ADC0808時(shí)鐘信號(hào)
0040 32               35                     RETI
                      36     
0041 7E01             37     DELAY:  MOV             R6,#1
0043 DEFE             38     D1:             DJNZ    R6,D1
0045 D5E0FB           39                     DJNZ    ACC,D1
0048 22               40                     RET
                      41     
                      42                     END
A51 MACRO ASSEMBLER  PWM                                                                  08/03/2006 11:16:36 PAGE     2

SYMBOL TABLE LISTING
------ ----- -------


N A M E             T Y P E  V A L U E   ATTRIBUTES

ACC. . . . . . . .  D ADDR   00E0H   A   
ADC. . . . . . . .  N NUMB   0035H   A   
CLOCK. . . . . . .  B ADDR   00A0H.4 A   
D1 . . . . . . . .  C ADDR   0043H   A   
DELAY. . . . . . .  C ADDR   0041H   A   
EOC. . . . . . . .  B ADDR   00A0H.6 A   
IE . . . . . . . .  D ADDR   00A8H   A   
INT_T0 . . . . . .  C ADDR   003EH   A   
OE . . . . . . . .  B ADDR   00A0H.7 A   
P1 . . . . . . . .  D ADDR   0090H   A   
P2 . . . . . . . .  D ADDR   00A0H   A   
P3 . . . . . . . .  D ADDR   00B0H   A   
PWM. . . . . . . .  B ADDR   00B0H.7 A   
ST . . . . . . . .  B ADDR   00A0H.5 A   
START. . . . . . .  C ADDR   000EH   A   
TH0. . . . . . . .  D ADDR   008CH   A   
TL0. . . . . . . .  D ADDR   008AH   A   
TMOD . . . . . . .  D ADDR   0089H   A   
TR0. . . . . . . .  B ADDR   0088H.4 A   
WAIT . . . . . . .  C ADDR   001CH   A   


REGISTER BANK(S) USED: 0 

ASSEMBLY COMPLETE.  0 WARNING(S), 0 ERROR(S)