#if defined(__AVR__)
void dmxSendByte(volatile uint8_t value)
{
  uint8_t bitCount, delCount;
  __asm__ volatile (
    "clin"                            <<==== DISABLE INTERRUPTS
    "ld __tmp_reg__,%a[dmxPort]n"
    "and __tmp_reg__,%[outMask]n"
    "st %a[dmxPort],__tmp_reg__n"
    "ldi %[bitCount],11n" // 11 bit intervals per transmitted byte
    "rjmp bitLoop%=n"     // Delay 2 clock cycles.
  "bitLoop%=:n"
    "ldi %[delCount],%[delCountVal]n"
  "delLoop%=:n"
    "nopn"
    "dec %[delCount]n"
    "brne delLoop%=n"
    "ld __tmp_reg__,%a[dmxPort]n"
    "and __tmp_reg__,%[outMask]n"
    "secn"
    "ror %[value]n"
    "brcc sendzero%=n"
    "or __tmp_reg__,%[outBit]n"
  "sendzero%=:n"
    "st %a[dmxPort],__tmp_reg__n"
    "dec %[bitCount]n"
    "brne bitLoop%=n"
    "sein"                             <<==== ENABLE INTERRUPTS
    :
      [bitCount] "=&d" (bitCount),
      [delCount] "=&d" (delCount)
    :
      [dmxPort] "e" (dmxPort),
      [outMask] "r" (~dmxBit),
      [outBit] "r" (dmxBit),
      [delCountVal] "M" (F_CPU/1000000-3),
      [value] "r" (value)
  );
}