Rainbow-electronics ATmega64M1 Manual do Utilizador descarregar pdf (Página 289)

289

8209A–AVR–08/09

ATmega16M1/32M1/64M1

28. Memory Programming

28.1 Program And Data Memory Lock Bits

The ATmega16M1/32M1/64M1 provides six Lock bits which can be left unprogrammed (“1”) or

can be programmed (“0”) to obtain the additional features listed in Table 28-2. The Lock bits can

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

Note: 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 28-1. 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 28-2. 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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