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Writing C Code for the 8051

Interrupt : Vector address ; Interrupt number
External0 0003h 0
Timer0 000Bh 1
External1 0013h 2
Timer 1 001Bh 3
Serial 0023h 4

c code

1. org 00h
2. ljmp main
3. org 0003h
4. ljmp ngat0
5. org 30h
6. main:
7. ...
8. Here: sjmp Here
9. ngat0:
10. ...
11. reti

code C
box code

1. void main
   
2. {
   
3. ...
   
4. while(1)
   
5. }
   
6. void ngat0(void) interrupt 0
   
7. {
   
8. ...
   
9. }