1.

Briefly explain arithmetic instructions.

Answer»

These instructions perform several basic arithmetic operations. After execution, the result is stored in the first operand. 8 bit addition, subtraction, multiplication, increment-decrement instructions can be performed in 8051.

Example:
ADDA, Rn
ADDA, #8 bit data
ADDC A, Direct
ADDC A, Rn
ADDC A, @Ri
ADDC A, #8 bit data
SUBB A, Rn
SUBB A, Direct
SUBB A, @Ri
SUBB A, #8 bit data
INC A
INC Rn
INC Direct
INC @Ri
DEC A
DEC Rn
DEC Direct
DEC @Ri
INC DPTR
MUL A B
DIVA B
DA A


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