can someone help me in understanding that when microprocessor is loaded with extra RAM how the microprocessor will address it???

 

A microprocessor can increase its memory capacity in a number of ways. The traditional microprocessor comes with an address & data bus that allows the microprocessor to interface with an external memory chip. This memory becomes an expansion on the microprocessor's internal memory structure.

Typical microcontrollers are self contained and do not provide this type of memory interface. One way of increasing the memory capacity of a microcontroller is to use an external memory with a serial interface. These ICs come in different varieties requiring very few interface pins, one to four pins at the most. With this type of memory, the data can be viewed at in the same manner as any input/output device or as a hard disk drive.