AT90USB646-AU Datasheet, PDF (69/456 Pages) ATMEL Corporation – 8-bit Atmel Microcontroller with 64/128Kbytes of ISP Flash and USB Controller

AT90USB64/128
Table 10-1. Reset and interrupt vectors. (Continued)
Vector Program
no.
address ⁽²⁾ Source
Interrupt definition
30
$003A
ADC
ADC Conversion Complete
31
$003C
EE READY
EEPROM Ready
32
$003E
TIMER3 CAPT
Timer/Counter3 Capture Event
33
$0040
TIMER3 COMPA Timer/Counter3 Compare Match A
34
$0042
TIMER3 COMPB Timer/Counter3 Compare Match B
35
$0044
TIMER3 COMPC Timer/Counter3 Compare Match C
36
$0046
TIMER3 OVF
Timer/Counter3 Overflow
37
$0048
TWI
2-wire Serial Interface
38
$004A
SPM READY
Store Program Memory Ready
Notes: 1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader address at
reset, see “Memory programming” on page 359.
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.
Table 10-2. 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
Note: 1. The Boot Reset Address is shown in Table 29-8 on page 357. For the BOOTRST Fuse “1”
means unprogrammed while “0” means programmed.
10.1.1
Moving interrupts between application and boot space
The General Interrupt Control Register controls the placement of the Interrupt Vector table.
10.1.2 MCUCR – MCU Control Register
Bit
7
6
5
4
3
2
1
0
JTD
–
–
PUD
–
–
IVSEL IVCE
MCUCR
Read/write
R/W
R
R
R/W
R
R
R/W
R/W
Initial value
0
0
0
0
0
0
0
0
• Bit 1 – IVSEL: Interrupt Vector Select
When the IVSEL bit is cleared (zero), the Interrupt Vectors are placed at the start of the Flash
memory. When this bit is set (one), the Interrupt Vectors are moved to the beginning of the Boot
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