ATTINY817-MFR. datasheet(20/492 Pages) MICROCHIP

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6.8.1

Offset

Name

Bit Pos.

0x00

GPIOR0

7:0

GPIOR[7:0]

0x01

GPIOR1

7:0

GPIOR[7:0]

0x02

GPIOR2

7:0

GPIOR[7:0]

0x03

GPIOR3

7:0

GPIOR[7:0]

6.8.2

6.8.2.1

General Purpose I/O register n

These are general purpose registers that can be used to store data, such as global variables and flags, in

the bitaccessible I/O memory space.

Name:

GPIOR

Offset: 0x00 + n*0x01 [n=0..3]

Reset:

0x00

Property:

Bit

GPIOR[7:0]

Access

R/W

Reset

Bits 7:0 – GPIOR[7:0]: GPIO Register byte

6.9

FUSES - Configuration and User Fuses

Fuses are part of the non-volatile memory and holds factory calibration data and device configuration.

The fuses are available from device power-up. The fuses can be read by the CPU or the UPDI, but can

only be programmed or cleared by the UPDI. The configuration and calibration values stored in the fuses

are written to their respective target registers at the end of the start-up sequence.

The content of the Signature Row fuses (SIGROW) is pre-programmed, and cannot be altered. SIGROW

holds information such as device ID, serial number, and calibration values.

The fuses for peripheral configuration (FUSE) are pre-programmed, but can be altered by the user.

Altered values in the configuration fuses will be effective only after a Reset.

This device also provides a User Row fuse area (USERROW) that can hold application data. The

USERROW can be programmed on a locked device by the UPDI. This can be used for final configuration

without having programming or debugging capabilities enabled.

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