[PIC] Explanation for the below mentioned code which is mikro c program

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
const unsigned char SinLkUpTab[50]={0,8,16,24,31,39,47,55,62,70,77,85,92,99,
106,113,120,127,134,144,147,153,159,165,171,177,182,188,193,198,202,207,
211,215,219,223,226,229,232,235,238,240,242,244,246,247,248,249,250,250};
unsigned short cnt,inc,dec,sqinc,cnt1;
void interrupt()
{
if(dec==0)
{cnt++;
PWM1_Set_Duty(SinLkUpTab[cnt]);
}
else if(dec==1)
{cnt--;
PWM1_Set_Duty(SinLkUpTab[cnt]);
}
TMR1IF_bit=0;
TMR1H=0xFF;
TMR1L=0x76;
}
void main()
{
TRISB=0;
PORTC=0;
PORTB=0;
TRISC=0;
TRISA=0;
PORTA=0;
T1CON=0b00000001;
TMR1IF_bit=0;
TMR1H=0xFF;
TMR1L=0x76;
TMR1IE_bit=1;
cnt=0;
sqinc=0;
cnt1=0;
inc=0;
dec=0;
PWM1_Init(20000);
PWM1_Start();
INTCON=0xC0;
PORTA.b0=1;
while(1){
if(cnt==49&&dec==0)
{
dec=1;
}
else if(cnt==0&&dec==1)
{
PORTB.B1=~PORTB.B1;
dec=0;
}
}
}