Question

write Atmega328 assembly language instructions that will swap the lower nibble (bits [3:0]) of R30 with the upper nibble (bits [7:4]) of R30.

Answer 1

To swap the lower and upper nibbles of register R30 in Atmega328 assembly language, the 'swap R30' instruction is used. It is a single instruction that efficiently exchanges the low and high nibbles of the register.

Step-by-step explanation:

The question involves writing assembly language instructions for the Atmega328 microcontroller that will swap the lower nibble (bits [3:0]) with the upper nibble (bits [7:4]) of register R30. In assembly language for the Atmega328, this can be done using the swap instruction, which is specifically designed to swap the nibbles in a register.

Here is the assembly code that swaps the lower and upper nibble of R30:

swap R30

The swap instruction exchanges the low and high nibbles of the register specified. In this case, R30's lower nibble (bits [3:0]) is exchanged with its upper nibble (bits [7:4]). This is a simple and efficient way to perform the swap operation in a single instruction.