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ATmega644PA Datasheet(PDF) 282 Page - ATMEL Corporation |
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ATmega644PA Datasheet(HTML) 282 Page - ATMEL Corporation |
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282 / 468 page  282 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P Note: 1. “1” means unprogrammed, “0” means programmed Note: 1. “1” means unprogrammed, “0” means programmed 25.6 Entering the Boot Loader Program Entering the Boot Loader takes place by a jump or call from the application program. This may be initiated by a trigger such as a command received via USART, or SPI interface. Alternatively, the Boot Reset Fuse can be programmed so that the Reset Vector is pointing to the Boot Flash start address after a reset. In this case, the Boot Loader is started after a reset. After the applica- tion code is loaded, the program can start executing the application code. Note that the fuses cannot be changed by the MCU itself. This means that once the Boot Reset Fuse is pro- grammed, the Reset Vector will always point to the Boot Loader Reset and the fuse can only be changed through the serial or parallel programming interface. Note: 1. “1” means unprogrammed, “0” means programmed Table 25-2. Boot Lock Bit0 Protection Modes (Application Section)(1) BLB0 Mode BLB02 BLB01 Protection 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. Table 25-3. Boot Lock Bit1 Protection Modes (Boot Loader Section) (1) BLB1 Mode BLB12 BLB11 Protection 11 1 No restrictions for SPM or (E)LPM accessing the Boot Loader section. 2 1 0 SPM is not allowed to write to the Boot Loader section. 30 0 SPM is not allowed to write to the Boot Loader section, and (E)LPM executing from the Application section is not allowed to read from the Boot Loader section. If Interrupt Vectors are placed in the Application section, interrupts are disabled while executing from the Boot Loader section. 40 1 (E)LPM executing from the Application section is not allowed to read from the Boot Loader section. If Interrupt Vectors are placed in the Application section, interrupts are disabled while executing from the Boot Loader section. Table 25-4. Boot Reset Fuse (1) BOOTRST Reset Address 1 Reset Vector = Application Reset (address 0x0000) 0 Reset Vector = Boot Loader Reset (see Table 25-10 on page 291) |
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