用AVR Studio 4 不要直接用GCC 然后就能看见了
/* Copyright (c) 2004 Eric B. Weddington
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
/* $Id: iom16.h,v 1.14.2.6 2009/02/11 18:05:26 arcanum Exp $ */
/* avr/iom16.h - definitions for ATmega16 */
#ifndef _AVR_IOM16_H_
#define _AVR_IOM16_H_ 1
/* This file should only be included from <avr/io.h>, never directly. */
#ifndef _AVR_IO_H_
# error "Include <avr/io.h> instead of this file."
#endif
#ifndef _AVR_IOXXX_H_
# define _AVR_IOXXX_H_ "iom16.h"
#else
# error "Attempt to include more than one <avr/ioXXX.h> file."
#endif
/* Registers and associated bit numbers */
#define TWBR _SFR_IO8(0x00)
#define TWSR _SFR_IO8(0x01)
#define TWPS0 0
#define TWPS1 1
#define TWS3 3
#define TWS4 4
#define TWS5 5
#define TWS6 6
#define TWS7 7
#define TWAR _SFR_IO8(0x02)
#define TWGCE 0
这是文件中的一部分
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