The definition of ATmega16's I/O space is shown in "Register Overview" on page 318.
All ATmega16 I/O and peripherals are placed in the I/O space. All I/O locations can be accessed through the IN and OUT instructions to transfer data between the 32 general working registers and the I/O. I/O registers with addresses 0x00 - 0x1F can also be directly bit-addressed using the SBI and CBI instructions, while SBIS and SBIC are used to check the value of a certain bit. For more information, see the instruction set. When using the IN and OUT instructions, the address must be between 0x00 - 0x3F. If you want to access the I/O registers through the LD and ST instructions like SRAM, add 0x20 to the corresponding address.
In order to be compatible with subsequent products, unused bits should not be written "0", and reserved I/O registers should not be written.
Some status flags are cleared by writing "1". Note that unlike most other AVRs, the CBI and SBI instructions can only operate on certain bits, and therefore can be used with registers containing these status flags. The CBI and SBI instructions are only valid for registers from 0x00 to 0x1F.
The I/O and peripheral control registers are described in other chapters.
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