ATmega88 I/O P311 "Register Overview".
All I/O and peripherals of the ATmega88 are placed in the I/O space. All I/O addresses can be accessed by the LD/LDS/LDD and ST/STS/STD instructions to transfer data between the 32 general-purpose working registers and the I/O. The 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 whether a single bit is set. When using the IN and OUT instructions, the address must be between 0x00 - 0x3F. If you want to access the I/O registers like SRAM through LD and ST instructions, add 0x20 to the corresponding address. The ATmega88 is a complex microprocessor that supports more peripherals than the reserved 64 I/O (accessed through IN OUT instructions) can support. For the extended I/O space 0x60 - 0xFF, only ST/STS/STD and LD/LDS/LDD instructions can be used.
For compatibility with subsequent products, unused bits should be written to "0", and reserved I/O registers should not be written.
Some status flags are cleared by writing "1". CBI and SBI instructions can operate all bits of the I/O register and write "1" back to the set bits, thus clearing these flags. CBI and SBI instructions are only valid for registers between 0x00 and 0x1F.
I/O and peripheral control registers are introduced in other subsequent chapters.
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