ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 294

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

28. Memory Programming
28.1
294
Program And Data Memory Lock Bits
Atmel ATmega48PA/88PA/168PA [Preliminary]
The Atmel
ATmega88A/88PA/168A/168PA/328/328P provides six Lock bits. These can be left unpro-
grammed (“1”) or can be programmed (“0”) to obtain the additional features listed in
28-2. The Lock bits can only be erased to “1” with the Chip Erase command.
The Atmel ATmega48PA has no separate Boot Loader section, and the SPM instruction is
enabled for the whole Flash if the SELFPRGEN fuse is programmed (“0”). Otherwise the SPM
instruction is disabled.
Table 28-1.
Notes:
Table 28-2.
BLB12
BLB11
BLB02
BLB01
LB2
LB1
Notes:
Notes:
LB Mode
Lock Bit Byte
()
()
()
()
1
2
3
1. “1” means unprogrammed, “0” means programmed.
2. Only on Atmel ATmega88A/88PA/168A/168PA/328/328P.
1. “1” means unprogrammed, “0” means programmed.
Memory Lock Bits
2. Only on Atmel ATmega88A/88PA/168A/168PA/328/328P.
1. “Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
®
ATmega48PA provides two Lock bits and the Atmel
Lock Bit Byte
Lock Bit Protection Modes
LB2
1
1
0
(1)
LB1
1
0
0
Bit No
7
6
5
4
3
2
1
0
Protection Type
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.
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.
Description
–
–
Boot Lock bit
Boot Lock bit
Boot Lock bit
Boot Lock bit
Lock bit
Lock bit
(1)(2)
(1)
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
(1)
9223B–AVR–09/11
Table