1. Experimental topic:
Assume that the clock of the microcontroller is 12MHz. Please use timer T2 to program the P4.6 pin to output a rectangular wave with a period of 3s. The duty cycle coefficient is required to be 1:3. Observe the changes of LED10. (In one cycle, the time occupied by the high level is called duty cycle.)
2.KEIL code
#include sbit LED=P1^6; void main() { TMOD &=0X0F; TMOD |= 0x01; //Select the working mode 1 of timer T0 TH0 = (65536 - 50000)/256; //initial value of the upper four bits TL0 = (65536 - 50000)%256; //The initial value of the lower four bits overflows every 50ms EA = 1; // Enable general interrupt ET0 = 1; TR0 = 1; //Start the timer P1=0xff; while(1); } void Time0(void) interrupt 1 //Timer interrupt { static unsigned int i = 0; TH0 = (65536-50000)/256; TL0 = (65536-50000)%256; //The overflow period is set to 50ms i++; if(i==20) // overflow 20 times per second { LED=0; //1 second time is up, the level becomes low } if(i==60) { LED=1; //3 seconds have passed, the level becomes high i=0; //Count clear } }
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SD6411 1.5MHz 1.3A DC/DC Synchronous Buck IC
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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