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ATmega644PA Datasheet(PDF) 296 Page - ATMEL Corporation |
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ATmega644PA Datasheet(HTML) 296 Page - ATMEL Corporation |
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296 / 468 page  296 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P 26. Memory Programming 26.1 Program And Data Memory Lock Bits The ATmega164PA/324PA/644PA/1284P provides six Lock bits which can be left unpro- grammed (“1”) or can be programmed (“0”) to obtain the additional features listed in Table 26-2. The Lock bits can only be erased to “1” with the Chip Erase command. Note: 1. “1” means unprogrammed, “0” means programmed Table 26-1. 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 26-2. Lock Bit Protection Modes (1)(2) Memory Lock Bits Protection Type LB Mode LB2 LB1 1 1 1 No memory lock features enabled. 21 0 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) 30 0 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) BLB0 Mode BLB02 BLB01 11 1 No restrictions for SPM or (E)LPM accessing the Application section. 2 1 0 SPM is not allowed to write to the Application section. 30 0 SPM is not allowed to write to the Application section, and (E)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. 40 1 (E)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. |
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