单片机 c语言 占空比,51单片机占空比规划

Proteus仿真

P3.0输出占空比

T+、T-设置占空比时刻，每按一次加或减100ms

R+、R-设置占空比加减1% 初始为100ms 占空比50%

数码管前两位显现时刻单位s，后两位显现占空比单位%

示波器显现

运用定时器，防止了数码管显现和按键扫描延时，完成占空比实时输出。防止因延时等候。 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;