ATtiny167-ESSZ datasheet(225/282 Pages) ATMEL

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7728D–AVR–07/09

ATtiny87/ATtiny167

21. Memory Programming

21.1

Program and Data Memory Lock Bits

The ATtiny87/167 provides two Lock bits which can be left unprogrammed (“1”) or can be pro-

grammed (“0”) to obtain the additional features listed in Table 21-2. The Lock bits can only be

erased to “1” with the Chip Erase command. The ATtiny87/167 has no separate Boot Loader

section.

Note:

“1” means unprogrammed, “0” means programmed.

Notes:

1. Program the Fuse bits before programming the LB1 and LB2.

2. “1” means unprogrammed, “0” means programmed

21.2

Fuse Bits

The ATtiny87/167 has three Fuse bytes. Table 21-3, Table 21-4 & Table 21-5 describe briefly

the functionality of all the fuses and how they are mapped into the Fuse bytes.

The SPM instruction is enabled for the whole Flash if the SELFPRGEN fuse is programmed

(“0”), otherwise it is disabled.

Table 21-1.

Lock Bit Byte(Note:)

Lock Bit Byte

Bit No

Description

Default Value

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

–

1 (unprogrammed)

LB2

Lock bit

1 (unprogrammed)

LB1

Lock bit

1 (unprogrammed)

Table 21-2.

Lock Bit Protection Modes

(1)(2)

Memory Lock Bits

Protection Type

LB Mode

LB2

LB1

No memory lock features enabled.

Further programming of the Flash and EEPROM is disabled in

Parallel and Serial Programming mode. The Fuse bits are locked

in both Serial and Parallel Programming mode.(1)

Further programming and verification of the Flash and EEPROM

is disabled in Parallel and Serial Programming mode. The Fuse

bits are locked in both Serial and Parallel Programming mode.(1)

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