ATtiny261-ESSZ datasheet(171/227 Pages) ATMEL

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171

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

22. Memory Programming

This section describes the different methods for Programming the ATtiny261/461/861 memories.

22.1

Program And Data Memory Lock Bits

The ATtiny261/461/861 provides two Lock bits which can be left unprogrammed (“1”) or can be

programmed (“0”) to obtain the additional security listed in Table 22-2. The Lock bits can only be

erased to “1” with the Chip Erase command. The ATtiny261/461/861 has no separate Boot

Loader section. The SPM instruction is enabled for the whole Flash, if the SELFPROGEN fuse is

programmed (“0”), otherwise it is disabled.

Note:

1. “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

Table 22-1.

Lock Bit Byte

(1)

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 22-2.

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

High-voltage and Serial Programming mode. The Fuse bits are

locked in both Serial and High-voltage Programming mode.(1)

Further programming and verification of the Flash and EEPROM

is disabled in High-voltage and Serial Programming mode. The

Fuse bits are locked in both Serial and High-voltage

Programming mode.(1)

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