AT90PWM2 datasheet(287/365 Pages) ATMEL

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287

AT90PWM2/3

4317B–AVR–02/05

Memory

Programming

Program And Data

Memory Lock Bits

The AT90PWM2/3 provides six Lock bits which can be left unprogrammed (“1”) or can

be programmed (“0”) to obtain the additional features listed in Table 118. 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 117. Lock Bit Byte(1)

Lock Bit Byte

Bit No

Description

Default Value

–

1 (unprogrammed)

–

1 (unprogrammed)

BLB12

Boot Lock bit

1 (unprogrammed)

BLB11

Boot Lock bit

1 (unprogrammed)

BLB02

Boot Lock bit

1 (unprogrammed)

BLB01

Boot Lock bit

1 (unprogrammed)

LB2

Lock bit

1 (unprogrammed)

LB1

Lock bit

1 (unprogrammed)

Table 118. 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 Boot Lock bits and Fuse bits are locked in both

Serial and Parallel Programming mode.

(1)

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