282
2552K–AVR–04/11
ATmega329/3290/649/6490
Note:
1. “1” means unprogrammed, “0” means programmed
Note:
1. “1” means unprogrammed, “0” means programmed
26.5
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 26-2.
Boot Lock Bit0 Protection Modes (Application Section)
(1)BLB0
Mode
BLB02
BLB01
Protection
11
1
No restrictions for SPM or LPM accessing the Application section.
2
1
0
SPM is not allowed to write to the Application section.
3
0
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.
4
0
1
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 26-3.
Boot Lock Bit1 Protection Modes (Boot Loader Sectio
n)BLB1
Mode
BLB12
BLB11
Protection
11
1
No restrictions for SPM or LPM accessing the Boot Loader section.
2
1
0
SPM is not allowed to write to the Boot Loader section.
3
0
SPM is not allowed to write to the Boot Loader section, and 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.
4
0
1
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 26-4.
BOOTRST
Reset Address
1
Reset Vector = Application Reset (address 0x0000)
0