#define FOSC 11059200L
#define T1MS (65536-FOSC/12/1000)

unsigned char count_1;
unsigned char count_2;
unsigned char duty_cycle_1;
unsigned char duty_cycle_2;
sbit pwm_out_1 = P1^0;
sbit pwm_out_2 = P1^1;
void timer1_init()
{
TMOD = 0x01;
TL0 = T1MS;
TH0 = T1MS>>8;
TR0 = 1;
ET0 = 1;
EA = 1;
count_1 = count_2 = 0;
}


void timer1_isr() interrupt 1 using 1
{
TL0 = T1MS;
TH0 = T1MS;
count_1++;
count_2++;
if(count_1 == 100)
count_1 = 0;
if(count_2 == 100)
count_2 = 0;
count_1 > duty_cycle_1?(pwm_out_1 = 0):(pwm_out_1 = 1);
count_2 > duty_cycle_2?(pwm_out_2 = 0):(pwm_out_2 = 1);

}

void main(void)
{
duty_cycle_1 = 50;
duty_cycle_2 = 60;
timer1_init();
P2 = 0x0;
while(1)
{

}
return;
}

模擬結果