What is the internal general purpose memory of 8051 micro controller?

This question was previously asked in
RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 2)
View all RRB ALP Papers >
  1. 16 Byte
  2. 128 Byte
  3. 8 Byte
  4. 64 Byte

Answer (Detailed Solution Below)

Option 2 : 128 Byte
Free
General Science for All Railway Exams Mock Test
20 Qs. 20 Marks 15 Mins

Detailed Solution

Download Solution PDF

Architecture of 8051 Microcontroller

  • 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.

Latest RRB ALP Updates

Last updated on Jul 19, 2025

-> The Railway Recruitment Board has scheduled the RRB ALP Computer-based exam for 15th July 2025. Candidates can check out the Exam schedule PDF in the article.

-> RRB has also postponed the examination of the RRB ALP CBAT Exam of Ranchi (Venue Code 33998 – iCube Digital Zone, Ranchi) due to some technical issues.

-> UGC NET Result Date 2025 Out at ugcnet.nta.ac.in

-> UPPSC RO ARO Admit Card 2025 has been released today on 17th July 2025

-> Rajasthan Police SI Vacancy 2025 has been released on 17th July 2025

-> HSSC CET Admit Card 2025 has been released @hssc.gov.in

-> There are total number of 45449 Applications received for RRB Ranchi against CEN No. 01/2024 (ALP).

-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.

-> CSIR NET City Intimation Slip 2025 has been released at csirnet.nta.ac.in

-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.

->The candidates must have passed 10th with ITI or Diploma to be eligible for this post. 

->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.

-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways. 

-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.

-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here

-> Bihar Police Driver Vacancy 2025 has been released @csbc.bihar.gov.in.

Hot Links: dhani teen patti teen patti master gold download teen patti go teen patti real cash apk