leddisp.lst

xilinx 开发板程序

LEDDISP                                                                                                       PAGE 1

                       1            $MOD51
                       2    
  0070                 3    STACKTOP EQU    70H    ; start of stack (grows up)
  F000                 4    LEDREG   EQU    0F000H ; LED register address
                       5    
----                   6            DSEG
0030                   7            ORG     30H
0030                   8    CNTR:   DS      1      ; counter for wait routine
                       9    
----                  10            CSEG
0000                  11            ORG     0000H  ; program starts at 0 after reset
0000                  12    START:
                      13            ; initialize stack pointer ...
0000 758170           14            MOV     SP,#STACKTOP
                      15            ; and the initial bit pattern to display
0003 7401             16            MOV     A,#1
0005                  17    LOOP:
                      18            ; show the bits on the LED digit
0005 90F000           19            MOV     DPTR,#LEDREG
0008 F0               20            MOVX    @DPTR,A       
                      21            ; wait long enough so we can see the bits ...
0009 12000F           22            CALL    WAIT
                      23            ; then rotate the bit pattern ...
000C 23               24            RL      A
                      25            ; and then do it all again
000D 80F6             26            JMP     LOOP
                      27    
                      28    
                      29    ; this subroutine waits about 1 second
000F                  30    WAIT:   
000F C0E0             31            PUSH    ACC
0011 C0F0             32            PUSH    B
0013 75300A           33            MOV     cntr,#10
0016                  34    WAIT1:  
0016 75F000           35            MOV     B,#0
0019                  36    WAIT2:
0019 7400             37            MOV     A,#0
001B D5E0FD           38            DJNZ    ACC,$
001E D5F0F8           39            DJNZ    B,WAIT2
0021 D530F2           40            DJNZ    CNTR,WAIT1
0024 D0F0             41            POP     B
0026 D0E0             42            POP     ACC
0028 22               43            RET
                      44    
                      45            END

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

ACC. . . . . . . . . . . . . . .  D ADDR  00E0H  PREDEFINED  
B. . . . . . . . . . . . . . . .  D ADDR  00F0H  PREDEFINED  
CNTR . . . . . . . . . . . . . .  D ADDR  0030H  
LEDREG . . . . . . . . . . . . .    NUMB  F000H  
LOOP . . . . . . . . . . . . . .  C ADDR  0005H  
SP . . . . . . . . . . . . . . .  D ADDR  0081H  PREDEFINED  
STACKTOP . . . . . . . . . . . .    NUMB  0070H  
START. . . . . . . . . . . . . .  C ADDR  0000H  NOT USED  
WAIT . . . . . . . . . . . . . .  C ADDR  000FH  
WAIT1. . . . . . . . . . . . . .  C ADDR  0016H  
WAIT2. . . . . . . . . . . . . .  C ADDR  0019H