ATmega16(L)
Table 19. Reset and Interrupt Vectors Placement(1)
BOOTRST
IVSEL
Reset address
$0000
Interrupt Vectors Start Address
$0002
1
1
0
0
0
1
0
1
$0000
Boot Reset Address + $0002
$0002
Boot Reset Address
Boot Reset Address
Boot Reset Address + $0002
Note:
1. The Boot Reset Address is shown in Table 99 on page 252. 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 ATmega16 is:
Address Labels
$000
$002
$004
$006
$008
$00A
$00C
$00E
$010
$012
$014
$016
$018
$01A
$01C
$01E
$020
$022
$024
$026
$028
;
Code
Comments
jmp RESET
; Reset Handler
jmp EXT_INT0
jmp EXT_INT1
jmp TIM2_COMP
jmp TIM2_OVF
jmp TIM1_CAPT
jmp TIM1_COMPA
jmp TIM1_COMPB
jmp TIM1_OVF
jmp TIM0_OVF
jmp SPI_STC
jmp USART_RXC
jmp USART_UDRE
jmp USART_TXC
jmp ADC
; IRQ0 Handler
; IRQ1 Handler
; Timer2 Compare Handler
; Timer2 Overflow Handler
; Timer1 Capture Handler
; Timer1 CompareA Handler
; Timer1 CompareB Handler
; Timer1 Overflow Handler
; Timer0 Overflow Handler
; SPI Transfer Complete Handler
; USART RX Complete Handler
; UDR Empty Handler
; USART TX Complete Handler
; ADC Conversion Complete Handler
; EEPROM Ready Handler
; Analog Comparator Handler
; Two-wire Serial Interface Handler
; IRQ2 Handler
jmp EE_RDY
jmp ANA_COMP
jmp TWSI
jmp EXT_INT2
jmp TIM0_COMP
jmp SPM_RDY
; Timer0 Compare Handler
; Store Program Memory Ready Handler
$02A
$02B
$02C
$02D
$02E
$02F
...
RESET:
ldi r16,high(RAMEND) ; Main program start
out SPH,r16
ldi r16,low(RAMEND)
out SPL,r16
sei
; Set stack pointer to top of RAM
; Enable interrupts
<instr> xxx
...
...
43
2466E–AVR–10/02
ATMEL [ ATMEL ]
