51 Single-Chip Microcomputer timer simple example, 51 Single-Chip Microcomputer Timer

51 Single-Chip Microcomputer timer simple example, 51 Single-Chip Microcomputer Timer

The first time I wrote a blog, I don't know. Forget it. Just stick the Code directly.

1 #include <reg52.h>
 2 #include <intrins.h> // The header file will be used to rotate right
 3 // Macro definition
 4 #define uchar unsigned char
 5 #define uint unsigned int
 6 // Bit, variable declaration
 7 sbit led1 = P1 ^ 0;
 8 sbit dula = P2 ^ 6;
 9 sbit wela = P2 ^ 7;
10 uchar counter_ms, counter_s, led_flow = 0xfe;
11 uchar code digitron_data [] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};
12 // Delay function
13 void delay (uint z)
14 {
15 uint x, y;
16 for (x = 0; x <z; x ++)
17 for (y = 0; y <114; y ++);
18}
19 // Flow lamp function
20 void display_led ()
twenty one {
22 while (1) {
23 led_flow = _cror_ (led_flow, 1);
24 P1 = led_flow;
25 delay (500); // Call the delay function
26}
27}
28 // Digital tube function
29 void display_digitron (uchar i)
30 {
31 uchar tens, ones;
32 tens = i / 10; // Modulus gets ten digits
33 ones = i% 10; // find the remainder by finding the remainder
34
35 P0 = 0xff; // Turn off all digital tubes
36 wela = 1;
37 P0 = 0xfe;
38 wela = 0;
39
40 dula = 1;
41 P0 = digitron_data [tens];
42 dula = 0;
43 delay (1);
44
45 P0 = 0xff;
46 wela = 1;
47 P0 = 0xfd;
48 wela = 0;
49
50 dula = 1;
51 P0 = digitron_data [ones];
52 dula = 0;
53 delay (1);
54}
55 // Timer initialization function
56 void timer_init ()
57 {
58 TMOD = 0x10; // The address of TMOD is 0x89, cannot be divisible by 8, can only operate on bytes, not bit
59 TH1 = 0x4c;
60 TL1 = 0x00;
61 TR1 = 1; // The address of TCON is 0x88, you can operate on the bit
62}
63 // main function main
64 void main ()
65 {
66 timer_init (); // Call the timer initialization function
67 while (1) {
68 if (TF1 == 1) {
69 TF1 = 0;
70 TH1 = 0x4c;
71 TL1 = 0x00;
72 counter_ms ++;
73}
74 if (counter_ms == 20) {// counter_ms accumulating 20 times is 1 second
75 counter_ms = 0;
76 counter_s ++;
77}
78 if (counter_s == 60) {// counter_s accumulating 60 times is 1 minute
79 wela = 1;
80 P0 = 0xff;
81 wela = 0;
82 TR1 = 0;
83 display_led (); // Call the running light function
84 / *
85 led_flow = _cror_ (led_flow, 1);
86 P1 = led_flow;
87 delay (500);
88 * /
89} else {
90 display_digitron (counter_s); // Call the digital tube function
91}
92}
93}