timer.asm

自制单片机实验板.rar

;*****************************************************
;
;     This programme is for study Ver1.0.0 beta
;This programme must be run in 12MHz standard settings
;               Timer  programmer
;               Designer: Mr.Koii
;         Copyright 2002-2003 koiistudio
;     2002.12.25 at Changsha. H.N. P.R.China.
;
;*****************************************************

;*****************************************************
;延时10uS
;*****************************************************

time10us:               mov     r5,#05h                 ;11us
                        djnz    r5,$
                        ret

;*****************************************************
;延时50uS
;*****************************************************

time50us:               mov     r5,#19h                 ;51us
                        djnz    r5,$
                        ret

;*****************************************************
;延时100uS
;*****************************************************

time100us:              mov     r5,#31h                	;99.6us
                        djnz    r5,$
                        ret

;*****************************************************
;延时200uS
;*****************************************************

time200us:              mov     r5,#64h                 ;201us
                        djnz    r5,$
                        ret

;*****************************************************
;延时250uS
;*****************************************************

time250us:              mov     r5,#7ch                 ;249.6us
                        djnz    r5,$
                        ret

;*****************************************************
;延时350uS
;*****************************************************

time350us:              mov     r5,#0afh                 ;351us
time350us_1:            djnz    r5,time350us_1
                        ret

;*****************************************************
;延时500uS
;*****************************************************

time500us:              mov     r5,#0fah	       	;501us
time500us_1:            djnz    r5,time500us_1
                        ret

;*****************************************************
;延时1mS
;*****************************************************

time1ms:                mov     r5,#0fah		;1001us
time1ms_1:              nop
                        nop
                        djnz    r5,time1ms_1
                        ret

;*****************************************************
;延时2.5mS
;*****************************************************

time2_5ms:              mov     r5,#05h			;2.496ms
time2_5ms_1:            mov     r6,#0f8h		;497us
                        djnz    r6,$
                        djnz    r5,time2_5ms_1
                        ret

;*****************************************************
;延时10mS
;*****************************************************

time10ms:               mov    r5,#14h			;10.262ms
time10ms_1:             mov    r6,#0ffh		;511us
                        djnz   r6,$
                        djnz   r5,time10ms_1
                        ret

;*****************************************************
;延时50mS
;*****************************************************

time50ms:               mov    r5,#63h		        ;49.996ms
time50ms_1:             mov    r6,#0fbh		;503us
                        djnz   r6,$
                        djnz   r5,time50ms_1
                        ret

;*****************************************************
;延时100mS
;*****************************************************

time100ms:              mov     r5,#0c3h               ;100.036ms
time100ms_1:            mov     r6,#0ffh               ;511us
                        djnz    r6,$
                        djnz    r5,time100ms_1
                        ret

;*****************************************************
;延时200mS
;*****************************************************

time200ms:     	        mov     r5,#02h			;250.351ms
time200ms_1:            mov     r6,#0f4h	        ;125.173ms
time200ms_2:            mov     r7,#0ffh		;511us
                        djnz    r7,$
                        djnz    r6,time200ms_2
                        djnz    r5,time200ms_1
                        ret

;*****************************************************
;延时500mS
;*****************************************************

time500ms:     	        mov    r5,#04h			;500.701ms
time500ms_1:            mov    r6,#0f4h	        ;125.173ms
time500ms_2:            mov    r7,#0ffh		;511us
                        djnz   r7,$
                        djnz   r6,time500ms_2
                        djnz   r5,time500ms_1
                        ret

;*****************************************************
;延时1S
;*****************************************************

time1s:                 mov    r5,#08h			;1001.401ms
time1s_1:               mov    r6,#0f4h		;125.173ms
time1s_2:               mov    r7,#0ffh		;511us
                        djnz   r7,$
                        djnz   r6,time1s_2
                        djnz   r5,time1s_1
                        ret