Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 289)

289

7647A–AVR–02/08

ATmega32/64/M1/C1

See “Addressing the Flash During Self-Programming” on page 279 for details about the use of Z-

pointer during Self-Programming.

24. Memory Programming

24.1 Program And Data Memory Lock Bits

The ATmega32/64/M1/C1 provides six Lock bits which can be left unprogrammed (“1”) or can be

programmed (“0”) to obtain the additional features listed in Table 24-2. The Lock bits can only be

erased to “1” with the Chip Erase command.

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

Notes: 1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.

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

Table 24-1. 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 24-2. 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)

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 289