51單片機占空比設(shè)計

P3.0輸出占空比
T+、T-設(shè)置占空比時間，每按一次加或減100ms
R+、R-設(shè)置占空比加減1% 初始為100ms 占空比50%
數(shù)碼管前兩位顯示時間單位s，后兩位顯示占空比單位%
示波器顯示

使用定時器，避免了數(shù)碼管顯示和按鍵掃描延時，實現(xiàn)占空比實時輸出。避免因延時等待。 12MHz晶振程序如下

#include                                          #define        CLOCK        12000L#define        Fosc        12000000L#define        TMR        1#define        TMR_BASE        (unsigned int)(65536-(Fosc*TMR/CLOCK))#define        TMR_BASEH        TMR_BASE/0x100#define MASK 0xaa#define AddT 0xa8 #define CutT 0xa2#define AddR 0x8a#define CutR 0x2asbit OUT=P3^0;code unsigned char Num[10]={0xc0,0xf9,0xa4,0x30,0x99,0x92,0x82,0xf8,0x80,0x90};bit        T1ms_Fg;void Timer0_interrupt(void)  interrupt 1{TR0=0;TH0=TMR_BASEH;TL0+=TMR_BASE;TR0=1;T1ms_Fg=1;}void TMR0_Init(void){TMOD=0x01;TH0=TMR_BASEH;TL0=TMR_BASE;TR0=1;ET0=1;}        bit        Tmr_1ms_Fg,        Tmr_10ms_Fg,        Tmr_100ms_Fg;unsigned char        T100ms_count=10;         void timer(void){Tmr_1ms_Fg=0;Tmr_10ms_Fg=0;        Tmr_100ms_Fg=0;        if (T1ms_Fg){T1ms_Fg=0;        Tmr_1ms_Fg=1;--T100ms_count;        if (T100ms_count%10==0){Tmr_10ms_Fg=1;         }if (T100ms_count==0){T100ms_count=10;Tmr_100ms_Fg=1;         }}}        unsigned char T=1,R=50;				   
				
            

				
					
					
				
			
                
			
							

                
			            

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