Question

8051 can access up to ______ of program memory and ______ of external data memory.
1. 64 KB, 32 KB
2. 32 KB, 64 KB
3. 64 KB, 64 KB
4. 16 KB, 64 KB

Answer 1

Correct Answer - Option 3 : 64 KB, 64 KB

A maximum of 64 KB of Program Memory (ROM) and Data Memory (RAM) each can be interface with the 8051 Microcontroller.

Specification of 8051:

• 4 KB bytes on-chip program memory (ROM)
• 128 bytes on-chip data memory (RAM)

• 4 register banks
• 128 user-defined software flags
• 8-bit bidirectional data bus
• 16-bit unidirectional address bus
• 32 general-purpose registers each of 8-bit
• 16-bit Timers (usually 2, but may have more or less)
• Three internal and two external Interrupts
• Four 8-bit ports,(short model have two 8-bit ports)
• 16-bit program counter and data pointer