匯編語言比較準確延時程序

1、;* 便于初學者，較為精確的延時程序;* ;延時10uS ;* time10us: mov r5,#05h ;11us djnz r5,$ ret ;* ;延時50uS ;* time50us: mov r5,#19h ;51us djnz r5,$ ret ;* ;延時100uS ;* time100us: mov r5,#31h ;99.6us djnz r5,$ ret ;* ;延時200uS ;* time200us: mov r5,#64h ;201us djnz r5,$ ret ;* ;延時250uS ;* time250us: mov r5,#7ch ;249.6us djnz

2、 r5,$ ret ;* ;延時350uS ;* time350us: mov r5,#0afh ;351us time350us_1: djnz r5,time350us_1 ret ;* ;延時500uS ;* time500us: mov r5,#0fah ;501us time500us_1: djnz r5,time500us_1 ret ;* ;延時1mS ;* time1ms: mov r5,#0fah ;1001us time1ms_1: nop nop djnz r5,time1ms_1 ret ;* ;延時2.5mS ;* time2_5ms: mov r5,#05h ;2

3、.496ms time2_5ms_1: mov r6,#0f8h ;497us djnz r6,$ djnz r5,time2_5ms_1 ret ;* ;延時10mS ;* time10ms: mov r5,#14h ;10.262ms time10ms_1: mov r6,#0ffh ;511us djnz r6,$ djnz r5,time10ms_1 ret ;* ;延時50mS ;* time50ms: mov r5,#63h ;49.996ms time50ms_1: mov r6,#0fbh ;503us djnz r6,$ djnz r5,time50ms_1 ret ;* ;

4、延時100mS ;* time100ms: mov r5,#0c3h ;100.036ms time100ms_1: mov r6,#0ffh ;511us djnz r6,$ djnz r5,time100ms_1 ret ;* ;延時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 ;* ;延時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 ;* ;延時1S ;* time1s: mov r5,#08h ;1001.401ms time1s_1: mov r6,#0f4h ;125.173ms ti