AT90CAN128
Table 25. Reset and Interrupt Vectors (Continued)
Vector
No.
Program
Source
Interrupt Definition
Address(2)
30
31
32
33
34
35
36
37
0x003A
0x003C
0x003E
0x0040
0x0042
0x0044
0x0046
0x0048
TIMER3 COMPB Timer/Counter3 Compare Match B
TIMER3 COMPC Timer/Counter3 Compare Match C
TIMER3 OVF
USART1, RX
USART1, UDRE
USART1, TX
TWI
Timer/Counter3 Overflow
USART1, Rx Complete
USART1 Data Register Empty
USART1, Tx Complete
Two-wire Serial Interface
Store Program Memory Ready
SPM READY
Notes: 1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader
address at reset, see “Boot Loader Support – Read-While-Write Self-Programming”
on page 311.
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 26 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 loca-
tions. 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.
Table 26. Reset and Interrupt Vectors Placement(Note:)
BOOTRST
IVSEL
Reset Address
0x0000
Interrupt Vectors Start Address
0x0002
1
1
0
0
0
1
0
1
0x0000
Boot Reset Address + 0x0002
0x0002
Boot Reset Address
Boot Reset Address
Boot Reset Address + 0x0002
Note:
The Boot Reset Address is shown in Table 119 on page 323. For the BOOTRST Fuse
“1” means unprogrammed while “0” means programmed.
The most typical and general program setup for the Reset and Interrupt Vector
Addresses in AT90CAN128 is:
;AddressLabels Code
Comments
0x0000
0x0002
0x0004
0x0006
0x0008
0x000A
0x000C
0x000E
0x0010
0x0012
0x0014
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
RESET
; Reset Handler
; IRQ0 Handler
; IRQ1 Handler
; IRQ2 Handler
; IRQ3 Handler
; IRQ4 Handler
; IRQ5 Handler
; IRQ6 Handler
; IRQ7 Handler
EXT_INT0
EXT_INT1
EXT_INT2
EXT_INT3
EXT_INT4
EXT_INT5
EXT_INT6
EXT_INT7
TIM2_COMP ; Timer2 Compare Handler
TIM2_OVF ; Timer2 Overflow Handler
57
4250E–CAN–12/04
ATMEL [ ATMEL ]
