Arithmetic instructions in AVR microcontroller

Arithmetic Instructions are the instructions which perform basic arithmetic operations such as addition, subtraction, multiplication, etc. AVR micro-controller has 2 operands which are actually registers that hold the data. The left register is the source register while the right one is the source register.

The following table shows the arithmetic instructions :

Instruction	Operand	Explanation	Example
ADD	D, S	D = D+ S	ADD D, S
ADC	D, S	D = D+ S+ carry	ADC D, K
SUB	D, S	D = D- S	SUB D, S
SBC	D, S	D = D- S- carry	SBC D, S
MUL	Unsigned nos.	R1= Higher byte of the result R0= Lower byte of the result	MUL D, S
MULS	Signed nos.	R1= Higher byte of the result R0= Lower byte of the result	MULS D, S
MULSU	Signed nos. and Unsigned nos.	R1= Higher byte of the result R0= Lower byte of the result	MULSU D, S
INC	D	D= D+1	INC D
DEC	D	D= D-1	DEC D

Note : Here D and S stand for Destination and Source respectively.
D and S are registers. There is no instruction for division in AVR.

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