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<h2>Comments</h2>
<pre><code>; This is a comment</code></pre>

<h2>Labels</h2>
<pre><code>label1:   ; a label</code></pre>

<h2>Opcodes</h2>
<pre><code>LD
OUT

; lowercase
ldi
jmp label1
</code></pre>

<h2>Assembler directives</h2>
<pre><code>.segment CODE
.word $07d3
</code></pre>

<h2>Registers</h2>
<pre><code>LD A  ; "A"
LDA label1,x  ; "x"
</code></pre>

<h2>Strings</h2>
<pre><code>.include "header.asm"
</code></pre>

<h2>Numbers</h2>
<pre><code>ldi r24,#127
ldi r24,$80f0
ldi r24,#%01011000
</code></pre>

<h2>Constants</h2>
<pre><code>ldi r16, (0&lt;&lt;PB5)|(1&lt;&lt;PB4)|(1&lt;&lt;PB3)|(1&lt;&lt;PB2)|(1&lt;&lt;PB1)|(1&lt;&lt;PB0)</code></pre>

<h2>Example program to light up LEDs</h2>
<h3>Attach an LED (through a 220 ohm resistor) to any of the pins 0-12</h3>
<pre><code>; Pin Constant Values (Tested on Arduino UNO)
; PD0 - 0
; PD1 - 1
; PD2 - 2
; PD3 - 3
; PD4 - 4
; PD5 - 5
; PD6 - 6
; PD7 - 7

; PB0 - 8
; PB1 - 9
; PB2 - 10
; PB3 - 11
; PB4 - 12
; PB5 - 13 - System LED

start:

	; Set pins 0-7 to high
	ldi		r17, (1&lt;&lt;PD7)|(1&lt;&lt;PD6)|(1&lt;&lt;PD5)|(1&lt;&lt;PD4)|(1&lt;&lt;PD3)|(1&lt;&lt;PD2)|(1&lt;&lt;PD1)|(1&lt;&lt;PD0)
	out		PORTD, r17

	; Set pins 8-13 to high
	ldi		r16, (1&lt;&lt;PB5)|(1&lt;&lt;PB4)|(1&lt;&lt;PB3)|(1&lt;&lt;PB2)|(1&lt;&lt;PB1)|(1&lt;&lt;PB0)
	out		PORTB, r16

	; Set pins 0-7 to output mode
	ldi		r18, (1&lt;&lt;DDD7)|(1&lt;&lt;DDD6)|(1&lt;&lt;DDD5)|(1&lt;&lt;DDD4)|(1&lt;&lt;DDD3)|(1&lt;&lt;DDD2)|(1&lt;&lt;DDD1)|(1&lt;&lt;DDD0)
	out		DDRD, r18

	; Set pins 8-13 to output mode
	ldi		r19, (1&lt;&lt;DDB5)|(1&lt;&lt;DDB4)|(1&lt;&lt;DDB3)|(1&lt;&lt;DDB2)|(1&lt;&lt;DDB1)|(1&lt;&lt;DDB0)
	out		DDRB, r19

loop:
	rjmp loop ; loop forever
</code></pre>