Which one of the following is not the feature of 8051?

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UGC NET Paper 2: Electronic Science 29 Oct 2022 Shift 1
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  1. 128 bytes of RAM
  2. 4K bytes of on-chip ROM
  3. 16 Interupts
  4. Four 8-bit I/O ports

Answer (Detailed Solution Below)

Option 3 : 16 Interupts
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UGC NET Paper 1: Held on 21st August 2024 Shift 1
50 Qs. 100 Marks 60 Mins

Detailed Solution

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8051 has 64kB external program memory and 4kB on-chip program memory, and 64kB of external data memory, and 128 bytes of on-chip data memory.

8051 microcontroller:

1. An 8051 microcontroller’s memory is divided into program memory and data memory.

2. Program memory (ROM) is used for the permanent storage of a program to be executed, while Data memory (RAM) is used for temporarily storing and keeping intermediate results and variables.

The Block Diagram of an 8051 microcontroller is as shown:

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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