AVR单片机常用的延时函数.doc

AVR单片机常用的延时函数/*/C header files：Delay function for AVR/MCU：ATmega8 or 16 or 32/Version: 1.0beta/The author：/*/#include void delay8RC_us(unsigned int time) /8Mhz内部RC震荡延时Xus dotime-;while(time1);void delay8RC_ms(unsigned int time) /8Mhz内部RC震荡延时Xmswhile(time!=0)delay8RC_us(1000);time-; /*/void delay1M_1ms(void) /1Mhz延时1msunsigned char a,b,c;for(c=1;c0;c-)for(b=142;b0;b-)for(a=2;a0;a-);void delay1M_xms(unsigned int x) /1Mhz延时xmsunsigned int i;for(i=0;i0;b-)for(a=248;a0;a-);NOP(); void delay2M_xms(unsigned int x) /2Mhz延时xmsunsigned int i;for(i=0;i0;c-)for(b=8;b0;b-)for(a=34;a0;a-);void delay4M_1us(void) /4Mhz延时1usNOP();NOP(); void delay4M_xms(unsigned int x) /4Mhz延时xmsunsigned int i;for(i=0;i0;a-);void delay73782M_1ms(void) /7.3782Mhz延时1msunsigned char a,b,c;for(c=1;c0;c-)for(b=254;b0;b-)for(a=13;a0;a-);void delay73782M_xms(unsigned int x) /7.3782Mhz延时xmsunsigned int i;for(i=0;i0;c-)for(b=4;b0;b-)for(a=89;a0;a-);void delay8M_1us(void) /8Mhz延时1usunsigned char a,b;for(b=1;b0;b-)for(a=1;a0;a-);/*/void delay12M_1us(void) /12Mhz延时1usunsigned char a,b;for(b=1;b0;b-)for(a=3;a0;a-);void delay12M_1ms(void) /12Mhz延时1msunsigned char a,b;for(b=129;b0;b-)for(a=45;a0;a-);void delay12M_xms(unsigned int x) /12Mhz延时xmsunsigned int i;for(i=0;i0;b-)for(a=5;a0;a-);void delay16M_1ms(void) /16Mhz延时1msunsigned char a,b,c;for(c=17;c0;c-)for(b=134;b0;b-)for(a=2;a0;a-);void delay16M_xms(