AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

25. Memory Programming

25.1 Program And Data Memory Lock Bits

The AT90PWM2/2B/3/3B provides six Lock bits which can be left unprogrammed (“1”) or can be

programmed (“0”) to obtain the additional features listed in Table 25-2. The Lock bits can only be

erased to “1” with the Chip Erase command.

Table 25-1. Lock Bit Byte(1)

Lock Bit Byte

Bit No

Description

7

–

6

–

BLB12

5

Boot Lock bit

BLB11

4

Boot Lock bit

BLB02

3

Boot Lock bit

BLB01

2

Boot Lock bit

LB2

1

Lock bit

LB1

0

Lock bit

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

Default Value

1 (unprogrammed)

1 (unprogrammed)

1 (unprogrammed)

1 (unprogrammed)

1 (unprogrammed)

1 (unprogrammed)

1 (unprogrammed)

1 (unprogrammed)

Table 25-2. Lock Bit Protection Modes(1)(2)

Memory Lock Bits

Protection Type

LB Mode

LB2

LB1

1

1

1

No memory lock features enabled.

Further programming of the Flash and EEPROM is disabled in

2

1

0

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

3

0

0

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)

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

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

4317K–AVR–03/2013

280

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