ATMEGA64-16AI datasheet(64/393 Pages) ATMEL

64 / 393 page

ATmega64(L)

2490L–AVR–10/06

When the BOOTRST Fuse is programmed and the Boot section size set to 8K bytes, the

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

Address Labels

Code

Comments

.org 0x0002

0x0002

jmp

EXT_INT0

; IRQ0 Handler

0x0004

jmp

EXT_INT1

; IRQ1 Handler

...

;

0x0044

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

.org 0x7000

0x7000

RESET:

ldi

r16,high(RAMEND); Main program start

0x7001

out

SPH,r16

; Set Stack Pointer to top of RAM

0x7002

ldi

r16,low(RAMEND)

0x7003

out

SPL,r16

0x7004

sei

; Enable interrupts

0x7005

<instr>

xxx

When the BOOTRST Fuse is programmed, the Boot section size set to 8K bytes and the

IVSEL bit in the MCUCR Register is set before any interrupts are enabled, the most typ-

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

Address Labels

Code

Comments

;

.org 0x7000

0x7000

jmp

RESET

; Reset handler

0x7002

jmp

EXT_INT0

; IRQ0 Handler

0x7004

jmp

EXT_INT1

; IRQ1 Handler

...

;

0x7044

jmp

SPM_RDY ; Store Program Memory Ready Handler

0x7046

RESET:

ldi

r16,high(RAMEND); Main program start

0x7047

out

SPH,r16

; Set Stack Pointer to top of RAM

0x7048

ldi

r16,low(RAMEND)

0x7049

out

SPL,r16

0x704A

sei

; Enable interrupts

0x704B

<instr>

xxx

Moving Interrupts Between

Application and Boot Space

The General Interrupt Control Register controls the placement of the Interrupt Vector

table.

MCUCR – MCU Control

• 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 begin-

ning of the Boot Loader section of the Flash. The actual address of the start of the Boot

Bit

7654

321

0x35 (0x55)

SRE

SRW10

SM1

SM0

SM2

IVSEL

IVCE

MCUCR

Read/Write

R/W

Initial Value

0000

000

ATMEGA64-16AI Datasheet(PDF) 64 Page - ATMEL Corporation

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