STC15 最简单的采用T0/T2定时器输出可控频率PWM波

/*---------------------------------------------------------------------*/ /* --- STC MCU Limited ------------------------------------------------*/ /* --- STC15F4K60S4 系列 定时器0的16位自动重装载模式举例---------------*/ /* --- Mobile: (86)13922805190 -------------- -------------------------*/ /* --- Fax: 86-0513-55012956,55012947,55012969 ------------------------*/ /* --- Tel: 86-0513-55012928,55012929,55012966-------------------------*/ /* --- Web: www.STCMCU.com --------------------------------------------*/ /* --- Web: www.GXWMCU.com --------------------------------------------*/ /* 如果要在程序中使用此代码,请在程序中注明使用了STC的资料及程序 */ /* 如果要在文章中应用此代码,请在文章中注明使用了STC的资料及程序 */ /*---------------------------------------------------------------------*/ //本示例在Keil开发环境下请选择Intel的8058芯片型号进行编译 //若无特别说明,工作频率一般为11.0592MHz #include "reg51.h" //----------------------------------------------- #define FOSC 11059200L #define T1MS (65536-FOSC/1000) //1T模式 sfr P1M1 = 0x91; sfr P1M0 = 0x92; sfr IE2 = 0xaf; //中断使能寄存器2 sfr T2H = 0xD6; //定时器2高8位 sfr T2L = 0xD7; //定时器2低8位 sfr AUXR = 0x8e; //Auxiliary register sbit P10 = P1^0; sbit P11 = P1^1; //----------------------------------------------- /* Timer0 interrupt routine */ void tm0_isr() interrupt 1 { P10 = ! P10; //将测试口取反 } /* Timer2 interrupt routine */ void tm2_isr() interrupt 12 { P11 = ! P11; //将测试口取反 } //----------------------------------------------- /* main program */ void main() { P1M1 &= ~1; //P1.x 设置为推挽输出 P1M0 |= 1; AUXR |= 0x80; //定时器0为1T模式 TMOD = 0x00; //设置定时器为模式0(16位自动重装载) TL0 = T1MS; //初始化计时值 TH0 = T1MS >> 8; TR0 = 1; //定时器0开始计时 ET0 = 1; //使能定时器0中断 AUXR |= 0x04; //定时器2为1T模式 T2L = T1MS; //初始化计时值 T2H = T1MS >> 8; AUXR |= 0x10; //定时器2开始计时 IE2 |= 0x04; //开定时器2中断 EA = 1; while (1); }