delay500ms.lst

EasyStudy51-II单片机开发系统的库函数源代码.包含了EasyStudy51-II硬件的全部驱动.

A51 MACRO ASSEMBLER  DELAY500MS                                                           11/06/2008 01:10:40 PAGE     1


MACRO ASSEMBLER A51 V7.07
OBJECT MODULE PLACED IN delay500ms.obj
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE a51\delay500ms.a51 SET(SMALL) DEBUG PRINT(.\delay500ms.lst) OBJECT(delay50
                      0ms.obj) EP

LOC  OBJ            LINE     SOURCE

                       1     
                       2     NAME            DELAY500MS
                       3     PUBLIC          ES51_DELAY500MS
                       4     
                       5     ES51            segment code
----                   6     RSEG            ES51
                       7                     
0000                   8     ES51_DELAY500MS:
                       9     ; 延时500毫秒;[假设时钟为12MHZ];
                      10     ; 延时间约500ms(500.063ms)
                      11     ; 1+[(1+1+48*2+2)*250+1+2]*20+2 = 3+(100*250+3)*20 = 500063us = 500.063ms       
0000 7814             12             MOV     R0,     #20             ; 1us
0002                  13     DELAY500MS_LOOP1:
0002 79FA             14             MOV     R1,     #250            ; 1us
0004                  15     DELAY500MS_LOOP2:
0004 00               16             NOP                             ; 1
0005 7A30             17             MOV     R2,     #48             ; 1
0007 DAFE             18             DJNZ    R2,     $               ; 2*8 
0009 D9F9             19             DJNZ    R1,     DELAY500MS_LOOP2; 2us
000B D8F5             20             DJNZ    R0,     DELAY500MS_LOOP1; 2us
000D 22               21             RET                             ; 2us
                      22     
                      23             END
A51 MACRO ASSEMBLER  DELAY500MS                                                           11/06/2008 01:10:40 PAGE     2

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


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

DELAY500MS . . . .  N NUMB   -----       
DELAY500MS_LOOP1 .  C ADDR   0002H   R   SEG=ES51
DELAY500MS_LOOP2 .  C ADDR   0004H   R   SEG=ES51
ES51 . . . . . . .  C SEG    000EH       REL=UNIT
ES51_DELAY500MS. .  C ADDR   0000H   R   SEG=ES51


REGISTER BANK(S) USED: 0 


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