PCIF0 datasheet(236/294 Pages) ATMEL

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236

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

22. Memory Programming

22.1

Program and Data Memory Lock Bits

The Atmel

® AVR® provides two Lock bits which can be left unprogrammed (“1”) or can be pro-

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

erased to “1” with the Chip Erase command. The Atmel AVR 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

Table 22-1.

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 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

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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