ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 60

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

60
ATmega64(L)
Table 23. Reset and Interrupt Vectors (Continued)
Notes:
Table 24 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 24. Reset and Interrupt Vectors Placement
Note:
The most typical and general program setup for the Reset and Interrupt Vector
Addresses in ATmega64 is:
Vector
BOOTRST
No.
32
33
34
35
Address Labels Code
0x0000
0x0002
0x0004
0x0006
0x0008
0x000A
0x000C
0x000E
0x0010
0x0012
0x0014
0x0016
0x0018
0x001A
0x001C
1
1
0
0
1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader
2. When the IVSEL bit in MCUCR is set, Interrupt Vectors will be moved to the start of
3. The Interrupts on address 0x0030 - 0x0044 do not exist in ATmega103 compatibility
1. The Boot Reset Address is shown in Table 113 on page 289. For the BOOTRST
address at reset, see “Boot Loader Support – Read-While-Write Self-programming”
on page 277.
the Boot Flash section. The address of each Interrupt Vector will then be address in
this table added to the start address of the Boot Flash section.
mode.
Fuse “1” means unprogrammed while “0” means programmed.
Program
Address
0x003E
0x0040
0x0042
0x0044
IVSEL
(3)
(3)
(3)
(3)
0
1
0
1
(2)
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
Source
USART1, UDRE
USART1, TX
TWI
SPM READY
Reset Address
0x0000
0x0000
Boot Reset Address
Boot Reset Address
RESET
EXT_INT0
EXT_INT1
EXT_INT2
EXT_INT3
EXT_INT4
EXT_INT5
EXT_INT6
EXT_INT7
TIM2_COMP
TIM2_OVF
TIM1_CAPT
TIM1_COMPA
TIM1_COMPB
TIM1_OVF
Interrupt Definition
USART1 Data Register Empty
USART1, Tx Complete
Two-wire Serial Interface
Store Program Memory Ready
; Reset Handler
; IRQ0 Handler
; IRQ1 Handler
; IRQ2 Handler
; IRQ3 Handler
; IRQ4 Handler
; IRQ5 Handler
; IRQ6 Handler
; IRQ7 Handler
; Timer2 Compare Handler
; Timer2 Overflow Handler
; Timer1 Capture Handler
; Timer1 CompareA Handler
; Timer1 CompareB Handler
; Timer1 Overflow Handler
Comments
(1)
Interrupt Vectors Start Address
0x0002
Boot Reset Address + 0x0002
0x0002
Boot Reset Address + 0x0002
2490G–AVR–03/04