ATTINY817-MFR. datasheet(19/492 Pages) MICROCHIP

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Table 6-4. Device ID

Device Name

Signature Bytes Address

0x00

0x01

0x02

ATtiny417

0x1E

0x92

0x20

ATtiny817

0x1E

0x93

0x20

6.8

I/O Memory

All ATtiny417/817 I/Os and peripherals are located in the I/O space. The I/O address range from 0x00 to

0x3F can be accessed in a single cycle using IN and OUT instructions. The Extended I/O space from

0x0040 - 0x0FFF can be accessed by the LD/LDS/LDD and ST/STS/STD instructions, transferring data

between the 32 general purpose working registers and the I/O space.

I/O Registers within the address range 0x00 - 0x1F are directly bit-accessible using the SBI and CBI

instructions. In these registers, the value of single bits can be checked by using the SBIS and SBIC

instructions. Refer to the Instruction Set section for more details.

For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O

memory addresses should never be written.

Some of the interrupt flags are cleared by writing a '1' to them. On ATtiny417/817 devices, the CBI and

SBI instructions will only operate on the specified bit, and can therefore be used on registers containing

such interrupt flags. The CBI and SBI instructions work with registers 0x00 - 0x1F only.

General Purpose I/O Registers

The ATtiny417/817 devices provide four General Purpose I/O Registers. These registers can be used for

storing any information, and they are particularly useful for storing global variables and interrupt flags.

General Purpose I/O Registers, which recide in the address range 0x1C - 0x1F, are directly bit-accessible

using the SBI, CBI, SBIS, and SBIC instructions.

ATTINY817-MFR. Datasheet(PDF) 19 Page - Microchip Technology