adcsingl.lst

aduc812精典源代码下载,适合初学者

ADCSINGL                                                                                                      PAGE 1

                       1    ;********************************************************************
                       2    ;
                       3    ; Author        : ADI - Apps            www.analog.com/MicroConverter
                       4    ;
                       5    ; Date          : 28 May 1999
                       6    ;
                       7    ; File          : ADCsingl.asm
                       8    ;
                       9    ; Hardware      : ADuC812
                      10    ;
                      11    ; Description   : Performs repeated single ADC conversions and moves
                      12    ;                 results to P0 & P2.  Sets the red LED on the eval
                      13    ;                 board upon completion of each conversion.  A new
                      14    ;                 conversion is innitiated every 200ms.
                      15    ;                 All rate calculations assume an 11.0592MHz Mclk.
                      16    ;               
                      17    ;********************************************************************
                      18    
                      19    $MOD812                         ; Use 8052&ADuC812 predefined symbols
                      20    
  00B4                21    LED     EQU     P3.4            ; P3.4 drives red LED on eval board
  0000                22    CHAN    EQU     0               ; convert this ADC input channel..
                      23                                    ; ..chan values can be 0 thru 8
                      24    ;____________________________________________________________________
                      25                                                      ; BEGINNING OF CODE
----                  26    CSEG
                      27    
0000                  28    ORG 0000h
                      29    
0000 02004B           30            JMP     MAIN            ; jump to main program
                      31    ;____________________________________________________________________
                      32                                                 ; INTERRUPT VECTOR SPACE
0033                  33    ORG 0033h ; (ADC ISR)
                      34    
0033 85D980           35            MOV     P0,ADCDATAL     ; ADC result low byte to Port0  
0036 85DAA0           36            MOV     P2,ADCDATAH     ; high nibble and channel ID to Port2
0039 C2B4             37            CLR     LED             ; turn the LED on
003B 32               38            RETI
                      39    
                      40    ;====================================================================
                      41                                                           ; MAIN PROGRAM
004B                  42    ORG 004Bh
                      43    
004B                  44    MAIN:
                      45    
                      46    ; PRECONFIGURE...
                      47    
004B 75EF60           48            MOV     ADCCON1,#060h   ; power up ADC
004E 75D800           49            MOV     ADCCON2,#CHAN   ; select channel to convert
0051 D2AF             50            SETB    EA              ; enable interrupts
0053 D2AE             51            SETB    EADC            ; enable ADC interrupt
                      52    
                      53    ; PERFORM REPEATED SINGLE CONVERSIONS...
                      54    
0055 D2B4             55    AGAIN:  SETB    LED             ; turn the LED off
0057 120061           56            CALL    DELAY           ; delay 100ms
005A D2DC             57            SETB    SCONV           ; innitiate single ADC conversion
                      58                                    ; ADC ISR is called upon completion
ADCSINGL                                                                                                      PAGE 2

005C 120061           59            CALL    DELAY           ; delay 100ms
005F 80F4             60            JMP     AGAIN           ; repeat
                      61    
                      62    ;____________________________________________________________________
                      63                                                             ; SUBROUTINE
                      64    
0061                  65    DELAY:                          ; delay 100ms
                      66    
0061 7FC8             67            MOV     R7,#200         ; 200 * 500us = 100ms
0063 7EE5             68    DLY1:   MOV     R6,#229         ; 229 * 2.17us = 500us
0065 DEFE             69            DJNZ    R6,$            ; sit here for 500us
0067 DFFA             70            DJNZ    R7,DLY1         ; repeat 200 times (100ms total)
0069 22               71            RET
                      72    
                      73    ;____________________________________________________________________
                      74    
                      75    END

VERSION 1.2h ASSEMBLY COMPLETE, 0 ERRORS FOUND
ADCSINGL                                                                                                      PAGE 3

ADCCON1. . . . . . . . . . . . .  D ADDR  00EFH  PREDEFINED  
ADCCON2. . . . . . . . . . . . .  D ADDR  00D8H  PREDEFINED  
ADCDATAH . . . . . . . . . . . .  D ADDR  00DAH  PREDEFINED  
ADCDATAL . . . . . . . . . . . .  D ADDR  00D9H  PREDEFINED  
AGAIN. . . . . . . . . . . . . .  C ADDR  0055H  
CHAN . . . . . . . . . . . . . .    NUMB  0000H  
DELAY. . . . . . . . . . . . . .  C ADDR  0061H  
DLY1 . . . . . . . . . . . . . .  C ADDR  0063H  
EA . . . . . . . . . . . . . . .  B ADDR  00AFH  PREDEFINED  
EADC . . . . . . . . . . . . . .  B ADDR  00AEH  PREDEFINED  
LED. . . . . . . . . . . . . . .    NUMB  00B4H  
MAIN . . . . . . . . . . . . . .  C ADDR  004BH  
P0 . . . . . . . . . . . . . . .  D ADDR  0080H  PREDEFINED  
P2 . . . . . . . . . . . . . . .  D ADDR  00A0H  PREDEFINED  
P3 . . . . . . . . . . . . . . .  D ADDR  00B0H  PREDEFINED  
SCONV. . . . . . . . . . . . . .  B ADDR  00DCH  PREDEFINED