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How many bits are used in the data bus of 8051 ?

How many bits are used in the data bus of 8051 ? Correct Answer 8

  • 8051 is an 8-bit (data bus) microcontroller built with 40 pins DIP (dual inline package).
  • 8051 has internal RAM (128 Bytes) and ROM (4K Bytes).
  • Of the 128-byte internal RAM, only 16 bytes are bit-addressable. The rest must be accessed in byte format.

Notes:

The Block Diagram of an 8051 microcontroller is as shown:

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In an 8051 microcontroller,

  • Internal RAM (data memory) - 128 bytes
  • Internal memory (code memory) - 4 kB (ROM)
  • Timer/counter - 2
  • No. of interrupt - 5
  • I/O pins - 32
  • Serial port - 1

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