ATTINY817-MFR. datasheet(46/492 Pages) MICROCHIP

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NVMCTRL - Non Volatile Memory Controller

9.1

Features

•

Unified memory

•

In-system programmable

•

Self-programming and boot loader support

•

Configurable sections for write protection:

–

Boot section for boot loader code or application code

–

Application code section for application code

–

Application data section for application code or data storage

•

Signature Row for factory-programmed data:

–

ID for each device type

–

Serial number for each device

–

Calibration bytes for factory calibrated peripherals

•

User Row for application data:

–

32 bytes in size

–

Can be read and written from software

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Can be written from UPDI on locked device

–

Content is kept after chip erase

9.2

Overview

The NVM Controller (NVMCTRL) is the interface between the device, the Flash, and the EEPROM. The

Flash and EEPROM are reprogrammable memory blocks that retain their values even when not powered.

The Flash is mainly used for program storage, but can also be used for data storage. The EEPROM is

used for data storage and can be programmed while the CPU is running the program from the Flash.

9.2.1

Block Diagram

Figure 9-1. NVMCTRL Block Diagram

Flash

EEPROM

NVM Block

Signature Row

User Row

NVMCTRL

Program Memory Bus

Data Memory Bus

9.2.2

System Dependencies

In order to use this peripheral, other parts of the system must be configured correctly, as described below.

ATtiny417/817

Datasheet Complete

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