ATEMGA128L View Datasheet(PDF) - Atmel Corporation
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MFG CO.
'ATEMGA128L' PDF : 395 Pages View PDF
Table 23. Reset and Interrupt Vectors (Continued)
Vector Program
No. Address(2) Source
Interrupt Definition
31
$003C(3) USART1, RX
USART1, Rx Complete
32
$003E(3) USART1, UDRE USART1 Data Register Empty
33
$0040(3) USART1, TX
USART1, Tx Complete
34
$0042(3) TWI
Two-wire Serial Interface
35
$0044(3) 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 “Boot Loader Support – Read-While-Write Self-Programming”
on page 276.
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 address in
this table added to the start address of the boot Flash section.
3. The Interrupts on address $0030 - $0044 do not exist in ATmega103 compatibility
mode.
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
BOOTRST IVSEL Reset Address
Interrupt Vectors Start Address
1
0
$0000
$0002
1
1
$0000
Boot Reset Address + $0002
0
0
Boot Reset Address
$0002
0
1
Boot Reset Address
Boot Reset Address + $0002
Note: The Boot Reset Address is shown in Table 112 on page 287. For the BOOTRST fuse “1”
means unprogrammed while “0” means programmed.
60 ATmega128
2467O–AVR–10/06
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