AVR108 ATmega8515

Berikut adalah kode AVR108

;**** A P P L I C A T I O N   N O T E   A V R 1 0 8 ************************
;*
;* Title:  Load Program Memory
;* Version:  1.0
;* Last updated: 98.02.27
;* Target:  AT90Sxx1x and higher (Devices with SRAM)
;*
;* Support E-mail: avr@atmel.com
;*
;* DESCRIPTION
;* This Application note shows how to use the Load Program Memory (LPM)
;* instruction. The App. note loads the string "Hello World" from 
;* program memory byte by byte, and puts it onto port B.
;*
;***************************************************************************

.include "8515def.inc"
.device AT90S8515   ; Specify device
.def temp =r16   ; Define temporary variable

start: ldi temp,low(RAMEND)
 out SPL,temp  ; Set stack pointer to last internal RAM location
 ldi temp,high(RAMEND)
 out SPH,temp

 ldi temp,$ff
 out PORTB,temp  ; Set all pins at port B high
 out DDRB,temp  ; Set port B as output

 ; Load the address of 'message' into the Z register. Multiplies
 ; word address with 2 to achieve the byte address, and uses the
 ; functions high() and low() to calculate high and low address byte.

 ldi ZH,high(2*message) ; Load high part of byte address into ZH
 ldi ZL,low(2*message) ; Load low part of byte address into ZL

loadbyte:
 lpm    ; Load byte from program memory into r0
 tst r0   ; Check if we've reached the end of the message
 breq quit   ; If so, quit
 out PORTB,r0  ; Put the character onto Port B
 rcall one_sec_delay  ; A short delay
 adiw ZL,1   ; Increase Z registers
 rjmp loadbyte

quit: rjmp quit

one_sec_delay:
 ldi r20, 20
 ldi r21, 255
 ldi r22, 255
delay: dec r22
 brne delay
 dec r21
 brne delay
 dec r20
 brne delay
 ret

message:
.db "Hello World"
.db 0