Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 265)

265

ATmega169V/L

2514A–AVR–08/02

Memory

Programming

Program And Data

Memory Lock Bits

The ATmega169 provides six Lock bits which can be left unprogrammed (“1”)orcanbe

programmed (“0”) to obtain the additional features listed in Table 117. The Lock bits can

only be erased to “1” with the Chip Erase command.

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

Table 116. Lock Bit Byte

(1)

Lock Bit Byte Bit No Description Default Value

7 – 1 (unprogrammed)

6 – 1 (unprogrammed)

BLB12 5 Boot Lock bit 1 (unprogrammed)

BLB11 4 Boot Lock bit 1 (unprogrammed)

BLB02 3 Boot Lock bit 1 (unprogrammed)

BLB01 2 Boot Lock bit 1 (unprogrammed)

LB2 1 Lock bit 1 (unprogrammed)

LB1 0 Lock bit 1 (unprogrammed)

Table 117. Lock Bit Protection Modes

(1)(2)

Memory Lock Bits Protection Type

LB Mode LB2 LB1

1 1 1 No memory lock features enabled.

210

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)

300

Further programming and verification of the Flash and

EEPROM is disabled in Parallel and Serial Programming

mode. The Boot Lock bits and Fuse bits are locked in both

Serial and Parallel Programming mode.

(1)

BLB0 Mode BLB02 BLB01

111

No restrictions for SPM or LPM accessing the Application

section.

2 1 0 SPM is not allowed to write to the Application section.

300

SPM is not allowed to write to the Application section, and

LPM executing from the Boot Loader section is not

allowed to read from the Application section. If Interrupt

Vectors are placed in the Boot Loader section, interrupts

are disabled while executing from the Application section.

401

LPM executing from the Boot Loader section is not

allowed to read from the Application section. If Interrupt

Vectors are placed in the Boot Loader section, interrupts

are disabled while executing from the Application section.

BLB1 Mode BLB12 BLB11

1 2 ... 260 261 262 263 264 265 266 267 268 269 270 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 265

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