AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 323

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

Memory Programming
Program and Data
Memory Lock Bits
4250C–CAN–03/04
The AT90CAN128 provides six Lock bits which can be left unprogrammed (“1”) or can
be programmed (“0”) to obtain the additional features listed in Table 122. The Lock bits
can only be erased to “1” with the Chip Erase command.
Table 121. Lock Bit Byte
Note:
Table 122. Lock Bit Protection Modes
BLB12
BLB11
BLB02
BLB01
LB2
LB1
BLB0 Mode
BLB1 Mode
LB Mode
Lock Bit Byte
1
2
3
1
2
3
4
1
Memory Lock Bits
1. “1” means unprogrammed, “0” means programmed
BLB02 BLB01
BLB12 BLB11
LB2
1
1
0
1
1
0
0
1
LB1
(1)
1
0
0
1
0
0
1
1
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.
No restrictions for SPM (Store Program Memory) or LPM
(Load Program Memory) accessing the Application section.
SPM is not allowed to write to the Application section.
SPM is not allowed to write to the Application section, and
LPM executing from the Boot Loader section is not allowed
to read from the Application section. If Interrupt Vectors are
placed in the Boot Loader section, interrupts are disabled
while executing from the Application section.
LPM executing from the Boot Loader section is not allowed
to read from the Application section. If Interrupt Vectors are
placed in the Boot Loader section, interrupts are disabled
while executing from the Application section.
No restrictions for SPM or LPM accessing the Boot Loader
section.
(1)(2)
Description
–
–
Boot Lock bit
Boot Lock bit
Boot Lock bit
Boot Lock bit
Lock bit
Lock bit
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
AT90CAN128
(1)
(1)
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