Session 3 : Looping

1. Loops, Conditional jump instructions
2. Conditions determeining conditional jump
3. Unconditional long & short jumps
4. Calculate target addresses for jumps
5. using stack in subroutines
6. Crystal frequenscy vs machine cycle
7. Code programs to generate time delay

Looping ex.3-1

 

MOV    A,#0                     ;;init

MOV    R2,#10

Again:    ADD A,#03        ;;loop body

DJNZ    R2,Again             ;;while test

MOV    R5,A                   ;;after loop

 

> init: A=0; R2=10;

> Loop: do {A+=3;} While (--R2!-0);

   DJNZ means "decrement, jump if not zero"

> after: R5 = A;