MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -A 16-bit integer can store 216 (or 65, 536) distinct values. In an unsigned representation, these values are the integers between 0 and 65, 535; using two’s complement, possible values range from −32, 768 to 32, 767. Hence, a processor with 16-bit memory addresses can directly access 64 KB of byte-addressable memory.

Detailed explanation-2: -Address bus It is concerned with passing an address one way, from the CPU to RAM. The sole purpose of an address bus is to identify the address of the location in cache or main memory that is to be read from or written to. Each location in memory will have its own unique address, this is known as addressability.

Detailed explanation-3: -In 8085 microprocessor, Address bus is of 16 bits (A0-A15) and can transfer maximum 16 bit address and hence can address 65, 536 different memory locations. This bus is multiplexed with 8 bit data bus. So, the most significant bits (MSB) of address goes through Address bus and LSB goes through multiplexed data bus.

Detailed explanation-4: -Address Bus Size The size of the address bus determines how much memory the CPU can address directly. For example, a 20-bit address bus can access up to one megabyte (1MB); 24 bits reaches 16MB, and 32 bits can handle four gigabytes (GB).