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3.8 Defining Data Types ................................................................................................................. 104
3.9 Type Conversions..................................................................................................................... 105
3.10 Operators................................................................................................................................ 106
3.11 Functions ................................................................................................................................ 107
3.12 Pointers................................................................................................................................... 108
3.13 Compiler Directives ................................................................................................................ 111
3.14 Accessing the I/O Registers ................................................................................................... 115
3.14.1 Bit level access to the I/O Registers............................................................................... 117
3.15 Accessing the EEPROM......................................................................................................... 118
3.16 Using Interrupts ...................................................................................................................... 119
3.17 RAM Memory Organization and Register Allocation .............................................................. 121
3.18 Using an External Startup Assembly File ............................................................................... 124
3.19 Including Assembly Language in Your Program .................................................................... 126
3.19.1 Calling Assembly Functions from C................................................................................ 127
3.20 Creating Libraries ................................................................................................................... 128
3.21 Using the AVR Studio Debugger ............................................................................................ 131
3.22 Compiling the Sample Code of the ATxmega Application Notes from Atmel ........................ 132
3.23 Hints........................................................................................................................................ 132
3.24 Limitations............................................................................................................................... 132
4. Library Functions Reference........................................................................................................ 133
4.1 Character Type Functions ........................................................................................................ 134
4.2 Standard C Input/Output Functions.......................................................................................... 135
4.3 Standard Library Functions ...................................................................................................... 140
4.4 Mathematical Functions............................................................................................................ 142
4.5 String Functions........................................................................................................................ 145
4.6 Variable Length Argument Lists Macros .................................................................................. 150
4.7 Non-local Jump Functions ........................................................................................................ 151
4.8 BCD Conversion Functions ...................................................................................................... 153
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