blink.lst

aduc812精典源代码下载,适合初学者

BLINK                                                                                                         PAGE 1

                       1    ;********************************************************************
                       2    ;
                       3    ; Author        : ADI - Apps            www.analog.com/MicroConverter
                       4    ;
                       5    ; Date          : 28 May 1999
                       6    ;
                       7    ; File          : blink.asm
                       8    ;
                       9    ; Hardware      : Any 8052 based MicroConverter (ADuC8xx)
                      10    ;
                      11    ; Description   : Blinks LED continuously.
                      12    ;                 200mSec period @ 50% duty cycle.
                      13    ;
                      14    ;********************************************************************
                      15    
                      16    $MOD52                          ; use 8052 predefined symbols
                      17    
  00B4                18    LED     EQU     P3.4            ; P3.4 is red LED on eval board
                      19    
                      20    ;____________________________________________________________________
                      21                                                           ; MAIN PROGRAM
----                  22    CSEG
                      23    
0000                  24    ORG  0000h
                      25    
0000 B2B4             26    BLINK:  CPL     LED             ; flash (complement) the red LED
0002 120007           27            CALL    DELAY           ; call software delay
0005 80F9             28            JMP     BLINK           ; repeat indefinately
                      29    
                      30    ;____________________________________________________________________
                      31                                                            ; SUBROUTINES
                      32    
0007                  33    DELAY:                          ; delay 100ms
                      34    
0007 7FC8             35            MOV     R7,#200         ; 200 * 500us = 100ms
0009 7EE5             36    DLY1:   MOV     R6,#229         ; 229 * 2.17us = 500us
000B DEFE             37            DJNZ    R6,$            ; sit here for 500us
000D DFFA             38            DJNZ    R7,DLY1         ; repeat 200 times (100ms delay)
000F 22               39            RET
                      40    
                      41    ;____________________________________________________________________
                      42    
                      43    END

VERSION 1.2h ASSEMBLY COMPLETE, 0 ERRORS FOUND
BLINK                                                                                                         PAGE 2

BLINK. . . . . . . . . . . . . .  C ADDR  0000H  
DELAY. . . . . . . . . . . . . .  C ADDR  0007H  
DLY1 . . . . . . . . . . . . . .  C ADDR  0009H  
LED. . . . . . . . . . . . . . .    NUMB  00B4H  
P3 . . . . . . . . . . . . . . .  D ADDR  00B0H  PREDEFINED