The Size of internal RAM of 8051 Microcontroller is?

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RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 2)
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  1. 128 Bytes
  2. 256 Bytes
  3. 16 Bytes
  4. 64 Bytes

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Option 1 : 128 Bytes
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Architecture of 8051 Microcontroller

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  • It is an 8-bit microcontroller.
  • It is built with 40 pins DIP (dual inline package), 4kb of ROM storage and 128 bytes of RAM storage, and 2 16-bit timers.
  • It consists of four parallel 8-bit ports, which are programmable and addressable as per the requirement. An on-chip crystal oscillator is integrated into the microcontroller having a crystal frequency of 12 MHz.
  • The system bus connects all the support devices to the CPU.
  • The system bus consists of an 8-bit data bus, a 16-bit address bus, and bus control signals.
  • All devices like program memory, ports, data memory, serial interface, interrupt control, timers, and the CPU are interfaced together through the system bus.
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