z80 Assembly nested loops

Question

I need to write three nested loops in Assembly on a z80 hardware. The first loop (the most internal one) should iterate 70 times, the other two 100 times.

This is the code I have come up with, but it seems not to work properly; it iterates until an interrupt is generated (Stack-Overflow error, I think).

loop1:
ld a, 46h
   loop2:
   ld b, 64h
      loop3:
      ld c, 64h
      dec c
      jnz c, (loop3)
   dec b
   jnz b, (loop2)
dec a
jnz a, (loop1)
halt

A similar code in C++ would be

for(int b = 100; c>0; c--)
   for(int c = 100; b>0; b--)
      for(int a = 70; a>0; a--)
       ...

Answer 1

This is how you initialize loops:

ld a, 46
loop1:
   ld b, 64
   loop2:
      ld c, 64
      loop3:
      dec c
      jnz c, loop3
   dec b
   jnz b, loop2
dec a
jnz a, loop1
halt