dacsine.lst

ADuC812的Analog输出程序

DACSINE                                                                                                       PAGE 1

                       1    ;********************************************************************
                       2    ;
                       3    ; Author        : ADI - Apps            www.analog.com/MicroConverter
                       4    ;
                       5    ; Date          : 28 May 1999
                       6    ;
                       7    ; File          : DACsine.asm
                       8    ;
                       9    ; Hardware      : ADuC812
                      10    ;
                      11    ; Description   : Outputs a sine waves on DAC0 at 720Hz.
                      12    ;                 Rate calculations assume an 11.0592MHz Mclk.
                      13    ;
                      14    ;********************************************************************
                      15    
                      16    $MOD812                         ; Use 8052&ADuC812 predefined symbols
                      17    
  00B4                18    LED     EQU     P3.4            ; P3.4 drives red LED on eval board
                      19    
                      20    ;____________________________________________________________________
                      21                                                      ; BEGINNING OF CODE
----                  22    CSEG
                      23    
0000                  24    ORG 0000h
                      25    
0000 75FD0D           26            MOV     DACCON,#00Dh    ; DAC0 on, 12bit, asynchronous
0003 75FA08           27            MOV     DAC0H,#008h
0006 75F900           28            MOV     DAC0L,#000h     ; DAC0 to mid-scale
                      29    
0009 901000           30            MOV     DPTR,#TABLE
                      31    
000C E4               32    STEP:   CLR     A               ;                                   1
000D 93               33            MOVC    A,@A+DPTR       ; get high data byte from table..   2
000E F5FA             34            MOV     DAC0H,A         ; ..and move it into DAC register   1
0010 A3               35            INC     DPTR            ; move on to get low byte           2
                      36    
0011 E4               37            CLR     A               ;                                   1
0012 93               38            MOVC    A,@A+DPTR       ; get low data byte from table..    2
0013 F5F9             39            MOV     DAC0L,A         ; ..and update DAC output           1
0015 A3               40            INC     DPTR            ; move on for next data point       2
                      41    
0016 53827F           42            ANL     DPL,#07Fh       ; wrap around at end of table       2
                      43    
0019 E5FA             44            MOV     A,DAC0H         ;                                   1
001B A2E3             45            MOV     C,ACC.3         ; MSB of DAC0 value                 1
001D 92B4             46            MOV     LED,C           ; LED = MSB of DAC0                 2
                      47    
001F 80EB             48            JMP     STEP            ;                                   2
                      49    
                      50    ; numbers at right in the above loop represent the number of machine
                      51    ; cycles for each instruction.  the complete loop takes exactly 20
                      52    ; machine cycles.  with an 11.0592MHz master clock, a machine cycle
                      53    ; is 1.085us, so the above loop takes 21.70us to update each data
                      54    ; point.  since there are 64 data points in the below sine lookup
                      55    ; table, this results in a 1.389ms period, i.e. a 720.0Hz frequency.
                      56    
                      57    ;____________________________________________________________________
                      58                                                      ; SINE LOOKUP TABLE
DACSINE                                                                                                       PAGE 2

1000                  59    ORG 01000h
                      60    
1000                  61    TABLE:
                      62    
1000 07FF             63    DB  007h, 0FFh
1002 08C8             64    DB  008h, 0C8h
1004 098E             65    DB  009h, 08Eh
1006 0A51             66    DB  00Ah, 051h
1008 0B0F             67    DB  00Bh, 00Fh
100A 0BC4             68    DB  00Bh, 0C4h
100C 0C71             69    DB  00Ch, 071h
100E 0D12             70    DB  00Dh, 012h
1010 0DA7             71    DB  00Dh, 0A7h
1012 0E2E             72    DB  00Eh, 02Eh
1014 0EA5             73    DB  00Eh, 0A5h
1016 0F0D             74    DB  00Fh, 00Dh
1018 0F63             75    DB  00Fh, 063h
101A 0FA6             76    DB  00Fh, 0A6h
101C 0FD7             77    DB  00Fh, 0D7h
101E 0FF5             78    DB  00Fh, 0F5h
1020 0FFF             79    DB  00Fh, 0FFh
1022 0FF5             80    DB  00Fh, 0F5h
1024 0FD7             81    DB  00Fh, 0D7h
1026 0FA6             82    DB  00Fh, 0A6h
1028 0F63             83    DB  00Fh, 063h
102A 0F0D             84    DB  00Fh, 00Dh
102C 0EA5             85    DB  00Eh, 0A5h
102E 0E2E             86    DB  00Eh, 02Eh
1030 0DA7             87    DB  00Dh, 0A7h
1032 0D12             88    DB  00Dh, 012h
1034 0C71             89    DB  00Ch, 071h
1036 0BC4             90    DB  00Bh, 0C4h
1038 0B0F             91    DB  00Bh, 00Fh
103A 0A51             92    DB  00Ah, 051h
103C 098E             93    DB  009h, 08Eh
103E 08C8             94    DB  008h, 0C8h
1040 07FF             95    DB  007h, 0FFh
1042 0736             96    DB  007h, 036h
1044 0670             97    DB  006h, 070h
1046 05AD             98    DB  005h, 0ADh
1048 04EF             99    DB  004h, 0EFh
104A 043A            100    DB  004h, 03Ah
104C 038D            101    DB  003h, 08Dh
104E 02EC            102    DB  002h, 0ECh
1050 0257            103    DB  002h, 057h
1052 01D0            104    DB  001h, 0D0h
1054 0159            105    DB  001h, 059h
1056 00F1            106    DB  000h, 0F1h
1058 009B            107    DB  000h, 09Bh
105A 0058            108    DB  000h, 058h
105C 0027            109    DB  000h, 027h
105E 0009            110    DB  000h, 009h
1060 0000            111    DB  000h, 000h
1062 0009            112    DB  000h, 009h
1064 0027            113    DB  000h, 027h
1066 0058            114    DB  000h, 058h
1068 009B            115    DB  000h, 09Bh
106A 00F1            116    DB  000h, 0F1h
DACSINE                                                                                                       PAGE 3

106C 0159            117    DB  001h, 059h
106E 01D0            118    DB  001h, 0D0h
1070 0257            119    DB  002h, 057h
1072 02EC            120    DB  002h, 0ECh
1074 038D            121    DB  003h, 08Dh
1076 043A            122    DB  004h, 03Ah
1078 04EF            123    DB  004h, 0EFh
107A 05AD            124    DB  005h, 0ADh
107C 0670            125    DB  006h, 070h
107E 0736            126    DB  007h, 036h          ; end of table
                     127    
                     128    ;____________________________________________________________________
                     129    
                     130    END

VERSION 1.2h ASSEMBLY COMPLETE, 0 ERRORS FOUND
DACSINE                                                                                                       PAGE 4

ACC. . . . . . . . . . . . . . .  D ADDR  00E0H  PREDEFINED  
DAC0H. . . . . . . . . . . . . .  D ADDR  00FAH  PREDEFINED  
DAC0L. . . . . . . . . . . . . .  D ADDR  00F9H  PREDEFINED  
DACCON . . . . . . . . . . . . .  D ADDR  00FDH  PREDEFINED  
DPL. . . . . . . . . . . . . . .  D ADDR  0082H  PREDEFINED  
LED. . . . . . . . . . . . . . .    NUMB  00B4H  
P3 . . . . . . . . . . . . . . .  D ADDR  00B0H  PREDEFINED  
STEP . . . . . . . . . . . . . .  C ADDR  000CH  
TABLE. . . . . . . . . . . . . .  C ADDR  1000H