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    mov r1,0     // sometimes, xor r1,r1 needs less program space and/
+or time
    mov r2,N
...
    inc r1       // may or may not set flags, depending on the impleme
+ntation
    cmp r1,r2    // often imlemented as sub r1,r2 but without actually
+ writing the result back to the register, just setting flags
    jne loop     // if implemented as sub r1,r2, jne (jump if not rqua
+l) is equal to jnz (jump if not zero)

    xor r1,r1
loop:
...
    inc r1  
    cmp r1,N
    jne loop

    mov r1,N
loop:
    // do something with r1
    dec r1     // must set/clear zero flag depending on value of r1
    jnz loop