Datasheet

62
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Notes: 1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader address at
reset, see ”Memory programming” on page 298.
2. When the IVSEL bit in MCUCR is set, Interrupt Vectors will be moved to the start of the Boot
Flash Section. The address of each Interrupt Vector will then be the address in this table
added to the start address of the Boot Flash Section.
3. Applies only to Atmel ATmega1284P.
Table 12-2 shows reset and Interrupt Vectors placement for the various combinations of
BOOTRST and IVSEL settings. If the program never enables an interrupt source, the Interrupt
Vectors are not used, and regular program code can be placed at these locations. This is also
the case if the Reset Vector is in the Application section while the Interrupt Vectors are in the
Boot section or vice versa.
Note: 1. The Boot Reset Address is shown in Table 26-10 on page 293. For the BOOTRST Fuse “1”
means unprogrammed while “0” means programmed.
28 $0036 SPM_READY Store Program Memory Ready
29 $0038 USART1_RX USART1 Rx Complete
30 $003A USART1_UDRE USART1 Data Register Empty
31 $003C USART1_TX USART1 Tx Complete
32 $003E TIMER3_CAPT
(3)
Timer/Counter3 Capture Event
33 $0040 TIMER3_COMPA
(3)
Timer/Counter3 Compare Match A
34 $0042 TIMER3_COMPB
(3)
Timer/Counter3 Compare Match B
35 $0044 TIMER3_OVF
(3)
Timer/Counter3 Overflow
Table 12-2. Reset and Interrupt Vectors placement
(1)
.
BOOTRST IVSEL Reset Address Interrupt Vectors Start Address
1 0 0x0000 0x0002
1 1 0x0000 Boot Reset Address + 0x0002
0 0 Boot Reset Address 0x0002
0 1 Boot Reset Address Boot Reset Address + 0x0002
Table 12-1. Reset and Interrupt Vectors. (Continued)
Vector
no.
Program
address
(2)
Source Interrupt definition