Microcontroller Exercise - Timer

For the relevant special registers, please refer to the relevant data

program code as follows:

Timer
 1 #include
 2 // Make the LED light up for 1000ms, dark for 300ms, light up for 300ms, dark for 1000ms, light up for 1000ms . Repeat this cycle .
 3 /*
 4 Test the 4 working modes of the timer
 5 The microcontroller clock is 11.0592MHz, and 1 machine cycle is 1.085us.
 6 Calculate the initial value: Take timer 0 as an example, the calculated value is Nus
 7 Mode 0: TH0 = (2^13 - (N/1.085)) / 2^5 = (8192 - N/1.085) / 32, TL0 = (8192 - N/1.085) % 32;
 8 Mode 1: TH0 = (2^16 - (N/1.085)) / 2^8 = (65536 - N/1.085) / 256, TL0 = (65536 - N/1.085) % 256;
 9 Mode 2: TH0 = TL0 = 2^8 - N/1.085 = 256 - N/1.085;
10 Mode 3: For timer 0, divide into 2 8-bit counters; For timer 1, stop counting
11 */ 
12
13 unsigned char t0Count, t1Count; //Store the number of timer interrupts
14 unsigned char t0H, t0L, t1H, t1L; //Store the initial value
15
16 //T0 mode 0, timing 5ms
17 void time0() interrupt 1
18 {
19     t0Count++;
20 }
21
22 //T1 mode 1, timing 50ms
23 void time1() interrupt 3
24 {
25     t1Count++;
26 }
27
28 void main()
29 {
30     t0Count = 0;
31     t1Count = 0;
32     t0H = (8192 - 5000 / 1.085) / 32;
33     t0L = (8192 - 5000 / 1.085);
34     t0L %= 32;
35     t1H = (65536 - 50000 / 1.085) / 256;
36     t1L = (65536 - 50000 / 1.085);
37     t1L %= 256;
38
39     TH0 = t0H; TL0 = t0L; // Initial value, timing 5ms
40     TH1 = t1H; TL1 = t1L; // Timing 50ms
41
42       EA = 1; //Enable interrupts
43     ET0 = 1; //Enable timer 0, timer 1 interrupts
44     ET1 = 1;
45     TMOD = 0x10; //T1 mode 1, T0 mode 0: TMOD = 0001 0000B
46     P1 = 0;
47     TR1 = 1; //Start timing T1, stop T0
48     TR0 = 0;
49     while(1)
50     {
51         if(t1Count==20) //Enough for 1000ms
52         {
53             if(!P1) //The diode is on, then change the frequency
54             {
55                 TR1 = 0; //Start timing T0, stop T1
56                 TR0 = 1;
57             }
58             TH1 = t1H; TL1 = t1L; //Time 50ms
59             t1Count = 0;
60             P1 = ~P1;
61        }
62         else if(t0Count==60) //Enough for 300ms
63         {
64             if(!P1) //The diode is on, then change the frequency
65             {
66                 TR1 = 1; //Let T1 start timing, T0 stop
67                 TR0 = 0;
68             }
69             TH0 = t0H; TL0 = t0L; //Timing 5ms
70             t0Count = 0;
71             P1 = ~P1;
72         }
73     }
74 }