ATmega16A datasheet(46/352 Pages) ATMEL

46 / 352 page

8154B–AVR–07/09

ATmega16A

When the BOOTRST Fuse is unprogrammed, the Boot section size set to 2K bytes and the

IVSEL bit in the GICR Register is set before any interrupts are enabled, the most typical and

general program setup for the Reset and Interrupt Vector Addresses is:

Address

Labels

Code

Comments

$000

RESET:

ldi

r16,high(RAMEND); Main program start

$001

out

SPH,r16

; Set Stack Pointer to top of RAM

$002

ldi

r16,low(RAMEND)

$003

out

SPL,r16

$004

sei

; Enable interrupts

$005

<instr>

xxx

;

.org $1C02

$1C02

jmp

EXT_INT0

; IRQ0 Handler

$1C04

jmp

EXT_INT1

; IRQ1 Handler

:..

;

$1C28

jmp

SPM_RDY

; Store Program Memory Ready Handler

When the BOOTRST Fuse is programmed and the Boot section size set to 2K bytes, the most

typical and general program setup for the Reset and Interrupt Vector Addresses is:

Address

Labels

Code

Comments

.org $002

$002

jmp

EXT_INT0

; IRQ0 Handler

$004

jmp

EXT_INT1

; IRQ1 Handler

:..

;

$028

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

.org $1C00

$1C00

RESET:

ldi

r16,high(RAMEND); Main program start

$1C01

out

SPH,r16

; Set Stack Pointer to top of RAM

$1C02

ldi

r16,low(RAMEND)

$1C03

out

SPL,r16

$1C04

sei

; Enable interrupts

$1C05

<instr>

xxx

When the BOOTRST Fuse is programmed, the Boot section size set to 2K bytes and the IVSEL

bit in the GICR Register is set before any interrupts are enabled, the most typical and general

program setup for the Reset and Interrupt Vector Addresses is:

Address

Labels

Code

Comments

.org $1C00

$1C00

jmp

RESET

; Reset handler

$1C02

jmp

EXT_INT0

; IRQ0 Handler

$1C04

jmp

EXT_INT1

; IRQ1 Handler

:..

;

$1C28

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

$1C2A

RESET:

ldi

r16,high(RAMEND); Main program start

$1C2B

out

SPH,r16

; Set Stack Pointer to top of RAM

ATmega16A 데이터시트(PDF) 46 Page - ATMEL Corporation

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