
61
7674F–AVR–09/09
ATmega164P/324P/644P
Notes:
1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader address at
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.
Table 10-2 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:
means unprogrammed while “0” means programmed.
The most typical and general program setup for the Reset and Interrupt Vector Addresses in
ATmega164P/324P/644P is:
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
Table 10-2.
Reset and Interrupt Vectors Placemen
tBOOTRST
IVSEL
Reset Address
Interrupt Vectors Start Address
1
0
0x0000
0x0002
1
0x0000
Boot Reset Address + 0x0002
0
Boot Reset Address
0x0002
0
1
Boot Reset Address
Boot Reset Address + 0x0002
Address
Labels
Code
Comments
0x0000
jmp
RESET
; Reset
0x0002
jmp
INT0
; IRQ0
0x0004
jmp
INT1
; IRQ1
0x0006
jmp
INT2
; IRQ2
0x0008
jmp
PCINT0
; PCINT0
0x000A
jmp
PCINT1
; PCINT1
0x000C
jmp
PCINT2
; PCINT2
0x000E
jmp
PCINT3
; PCINT3
0x0010
jmp
WDT
; Watchdog Timeout
0x0012
jmp
TIM2_COMPA
; Timer2 CompareA
0x0014
jmp
TIM2_COMPB
; Timer2 CompareB
0x0016
jmp
TIM2_OVF
; Timer2 Overflow
0x0018
jmp
TIM1_CAPT
; Timer1 Capture
0x001A
jmp
TIM1_COMPA
; Timer1 CompareA
0x001C
jmp
TIM1_COMPB
; Timer1 CompareB
0x001E
jmp
TIM1_OVF
; Timer1 Overflow
0x0020
jmp
TIM0_COMPA
; Timer0 CompareA
Table 10-1.
Reset and Interrupt Vectors (Continued)
Vector
No.
Program
Address(2)
Source
Interrupt Definition