Programming in AVR assembler language

Learning instructions by popularity

This instruction table is sorted by popularity. If you plan to learn all those in a 7-days-schedule, use column 1 as timetable, if you plan to learn all these in a 2-weeks-schedule, use column 2.

The following table shows the percentage of instructions used on this webpage that you will learn in those day schedules. Popularity data was taken from 192 source code files as of Dec., 2022.

Day	Instruction percentage
Day	7 days	2 weeks
1	59.4%	42.0%
2	78.7%	59.4%
3	90.2%	70.3%
4	96.2%	78.7%
5	98.8%	85.0%
6	99.9%	90.2%
7	100.0%	93.7%
8		96.2%
9		97.9%
10		98.8%
11		99.52%
12		99.86%
13		99.96%
14		100.00%

That means: with the 7-day-schedule you are familiar with 90% of the instruction within three days, with the 2-weeks-schedule you'll need six days for that.

Note that 30 instructions were never used in my source code files and do not appear here.

7 days	2 weeks	Instruction	Popul.	Usage and link	Additional hints
1	1	ldi	17.97%	LDI rh,c255
		out	7.52%	OUT p1,r1
		rjmp	6.22%	RJMP c4096
		rcall	5.54%	RCALL c4096	Requires stack operation
		reti	4.76%	RETI	Requires stack operation and I flag
	2	mov	4.28%	MOV r1,r2
		clr	3.53%	CLR r1
		brne	3.05%	BRNE c127
		cpi	2.29%	CPI rh,c255
		ret	2.23%	RET	Requires stack operation
		adc	1.98%	ADC r1,r2
2	3	nop	1.95%	NOP
		rol	1.91%	ROL r1
		sbi	1.90%	SBI pl,b7
		st	1.88%	ST (-)rp(+),r1	Pointer operation
		ror	1.74%	ROR r1
		add	1.53%	ADD r1,r2
	4	brcs	1.50%	BRCS c127
		cbi	1.49%	SBI pl,b7
		inc	1.49%	INC r1
		in	1.46%	IN r1,p1
		breq	1.29%	BREQ c127
		brcc	1.16%	BRCC c127
3	5	lpm	1.16%	LPM	Pointer operation
		dec	1.10%	DEC r1
		lsr	1.08%	LSR r1
		sbc	1.05%	SUB r1,r2
		ld	1.01%	LD r1,(-)rp(+)	Pointer operation
		sts	0.94%	STS c65535,r1
	6	tst	0.91%	TST r1
		lsl	0.89%	LSL r1
		sbr	0.87%	SBR rh,c255
		sbrc	0.86%	SBRC rh,b7
		push	0.85%	PUSH r1	Requires stack operation
		andi	0.82%	ANDI rh,c255
4	7	lds	0.76%	LDS r1,c65535
		pop	0.76%	POP r1	Requires stack operation
		cp	0.70%	CP r1,r2
		cbr	0.67%	CBR rh,255
		subi	0.63%	SUBI rh,c255
	8	sub	0.60%	SUB r1,r2
		or	0.39%	OR r1,r2
		sbiw	0.39%	SBIW rd,k63
		sbrs	0.37%	SBRS r1,b7
		cpc	0.36%	CPC r1,r2
		sei	0.36%	SEI	Requires stack operation and I flag
5	9	adiw	0.36%	ADIW rd,k63
		sbic	0.32%	SBIC pl,b7
		sleep	0.29%	SLEEP
		sbis	0.26%	SBIS pl,b7
		clt	0.23%	CLT
		swap	0.22%	SWAP r1
	10	set	0.20%	SET
		ori	0.18%	ORI rh,c255
		mul	0.16%	MUL r1,r2
		clc	0.15%	CLC
		sec	0.15%	SEC
		eor	0.13%	EOR r1,r2
6	11	com	0.13%	COM r1
		ldd	0.12%	LDD r1,ry+k63	Pointer operation
		and	0.12%	AND r1,r2
		std	0.12%	STD ry+k63,r1	Pointer operation
		brtc	0.10%	BRTC c127
		brts	0.10%	BRTS c127
	12	call	0.081%	-	Large devices
		cli	0.071%	CLI
		jmp	0.071%	-	Large devices
		ijmp	0.041%	IJMP	Pointer operation
		neg	0.041%	NEG r1
		ser	0.034%	SER rh
7	13	brhs	0.024%	BRHS c127
		sbci	0.024%	SBCI rh,c255
		brpl	0.017%	BRPL c127
		bld	0.010%	BLD r1,b7
		brlt	0.010%	BRLT c127
		brmi	0.010%	BRMI c127
	14	cpse	0.010%	CPSE r1,r2
		bst	0.007%	BST r1,b7
		clz	0.007%	CLZ
		sez	0.007%	SEZ
		wdr	0.007%	WDR