51单片机占空比设计

1、51 单片机占空比设计Proteus 仿真P3.0 输出占空比T+、T- 设置占空比时间，每按一次加或减100msR+、R-设置占空比加减1%初始为 100ms 占空比 50%数码管前两位显示时间单位s，后两位显示占空比单位示波器显示U1>XTAL1 11 XTAE2PO .07/0 P0.1/ZXJ1 P0.2/AO2P0 3"D3P0.4/O4P0.5/AC6P0.6；C6PO .7/AO72«31PSEMALEEAP2.0 朋P2.v/eP2.2/A1O P2.3/A11 P2.4/A12P2.5/A13 P2.6/A14 P2.7/A1522242827Q4.

2、2.3.4.5.B7 pp ppppppP3.0rRXD P3.1/D© P3.2币而 P3.3/lMnP3.4ZIDP3.V11P3.6®P3.7W10AT?9p5.1 TEXTT+(100MS)u=i占空比-（1 %）RP1RESPACI«6g&rro<TEXT>Oh；TO Ibbs: c5lnicu com使用定时器，避免了数码管显示和按键扫描延时，实 现占空比实时输出。避免因延时等待。12MHz晶振程序如下#include ;#define CLOCK 12000L#define Fosc 12000000L#define TMR 1#

3、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 0UT=P39;code unsigned charNum10=0xc0,0xf9,0xa4,0x30,0x99,0x92,0x82,0xf8, 0x80,0x90;bit T1ms_Fg;void Timer0_interrupt(void) i

4、nterrupt 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;void diaplay(void)static unsigned char status=0; if(!Tmr_10ms_Fg)return;P0=0xff;