DBRA: M68K instruction reference

dbraDecrement and branch 
Decrements the first operand by 1 and branches to the specified address if the first operand is not -1.
Size .w
Used in Loops and dbraM68K assembly
Arithmetic, logic and bitsM68K assembly
Arrays, strings and (a0)+M68K assembly
trap #15 and its tasksM68K assembly
Interrupts and cyclesM68K assembly
Fill an array with the numbers from 1 to 10M68K assembly
Sum of an arrayM68K assembly
The largest elementM68K assembly
Bit tests, shifts, masks and counting set bitsM68K assembly
Bubble sortM68K assembly
 
XNZVC –––––
Leaves every flag unchanged
Forms  dbra ,   
Operands Dn A data register, d0 to d7. More
label A branch target, written as a label or address. The assembler calculates the relative displacement. More
dbra is the same as dbf (will decrement until it reaches -1)
 * --- Loops d0+1 times (counter goes 5,4,3,2,1,0,-1 then stops) ---
move.l #5, d0
move.l #0, d1
loop:
    addq.l #1, d1
    dbra d0, loop
; d1 = 6 (looped 6 times)