def u64_to_hex16le(val):
    """! @brief Create 16-digit hexadecimal string from 64-bit register value"""
    return ''.join("%02x" % (x & 0xFF) for x in (
        val,
        val >> 8,
        val >> 16,
        val >> 24,
        val >> 32,
        val >> 40,
        val >> 48,
        val >> 56,
    ))