timer.lis

单片机中的定时器模块

                        .module timer.c
                        .area text(rom, con, rel)
 0000                   .dbfile F:\芯生光盘资料\范例代码\TIMER\prj\timer\timer.c
 0000                   .dbfunc e timer0_init _timer0_init fV
                        .even
 0000           _timer0_init::
 0000                   .dbline -1
 0000                   .dbline 16
 0000           ; 
 0000           ; #include <macros.h>
 0000           ; #include "stdtypes.h"
 0000           ; #include "timer.h"
 0000           ; 
 0000           ; 
 0000           ; 
 0000           ; UNS8 time_couter;
 0000           ; 
 0000           ; 
 0000           ; //TIMER0 initialize - prescale:64
 0000           ; // WGM: Normal
 0000           ; // desired value: 1mSec
 0000           ; // actual value:  0.998mSec (0.2%)
 0000           ; void timer0_init(void)
 0000           ; {
 0000                   .dbline 17
 0000           ;  TCCR0 = 0x00; //stop
 0000 2224              clr R2
 0002 23BE              out 0x33,R2
 0004                   .dbline 18
 0004           ;  ASSR  = 0x00; //set async mode
 0004 20BE              out 0x30,R2
 0006                   .dbline 19
 0006           ;  TCNT0 = SET_COUNT; //set count
 0006 8DE8              ldi R24,141
 0008 82BF              out 0x32,R24
 000A                   .dbline 20
 000A           ;  TCCR0 = 0x07; //start timer
 000A 87E0              ldi R24,7
 000C 83BF              out 0x33,R24
 000E                   .dbline 21
 000E           ;  TIMSK = TIMSK | (1 << TOIE0);
 000E 87B7              in R24,0x37
 0010 8160              ori R24,1
 0012 87BF              out 0x37,R24
 0014                   .dbline 23
 0014           ;  
 0014           ;  time_couter=0;
 0014 20920000          sts _time_couter,R2
 0018                   .dbline -2
 0018           L1:
 0018                   .dbline 0 ; func end
 0018 0895              ret
 001A                   .dbend
                        .area vector(rom, abs)
                        .org 64
 0040 0C940D00          jmp _timer0_ovf_isr
                        .area text(rom, con, rel)
 001A                   .dbfile F:\芯生光盘资料\范例代码\TIMER\prj\timer\timer.c
 001A                   .dbfunc e timer0_ovf_isr _timer0_ovf_isr fV
                        .even
 001A           _timer0_ovf_isr::
 001A 2A92              st -y,R2
 001C 8A93              st -y,R24
 001E 9A93              st -y,R25
 0020 2FB6              in R2,0x3f
 0022 2A92              st -y,R2
 0024                   .dbline -1
 0024                   .dbline 28
 0024           ; }
 0024           ; 
 0024           ; #pragma interrupt_handler timer0_ovf_isr:17
 0024           ; void timer0_ovf_isr(void)
 0024           ; {
 0024                   .dbline 31
 0024           ;  //CLI(); //disable all interrupts
 0024           ;  
 0024           ;  TCNT0 = SET_COUNT;
 0024 8DE8              ldi R24,141
 0026 82BF              out 0x32,R24
 0028                   .dbline 35
 0028           ; /*read the key value*/
 0028           ; 
 0028           ;   
 0028           ;        if(time_couter>10)
 0028 8AE0              ldi R24,10
 002A 20900000          lds R2,_time_couter
 002E 8215              cp R24,R2
 0030 20F4              brsh L3
 0032                   .dbline 36
 0032           ;        {
 0032                   .dbline 37
 0032           ;          time_couter=0;
 0032 2224              clr R2
 0034 20920000          sts _time_couter,R2
 0038                   .dbline 38
 0038           ;        }
 0038 05C0              xjmp L4
 003A           L3:
 003A                   .dbline 40
 003A                   .dbline 41
 003A 80910000          lds R24,_time_couter
 003E 8F5F              subi R24,255    ; addi 1
 0040 80930000          sts _time_couter,R24
 0044                   .dbline 42
 0044           L4:
 0044                   .dbline -2
 0044           L2:
 0044 2990              ld R2,y+
 0046 2FBE              out 0x3f,R2
 0048 9991              ld R25,y+
 004A 8991              ld R24,y+
 004C 2990              ld R2,y+
 004E                   .dbline 0 ; func end
 004E 1895              reti
 0050                   .dbend
                        .area bss(ram, con, rel)
 0000                   .dbfile F:\芯生光盘资料\范例代码\TIMER\prj\timer\timer.c
 0000           _time_couter::
 0000                   .blkb 1
 0001                   .dbsym e time_couter _time_couter c