Consider a 32bit microprocessor having 32bit instructions composed of two fields: the first 8 bit for opcode, and the remaining 24 bit for an immediate operand or an operand address.

(1) what is the maximum directly addressable memory capacity in bytes?

(2) If a 32bit address bus and a 16bit data bus used, how to access a 32bit instruction?

(3) If a 16bit address bus and a 16bit data bus used, how to access a 32bit instruction?