PyQdeck LogoPyQdeckSubjectsSyllabusBlog
Back to the 2020 paper

Module 2: The 8051 Architecture

20202m

Which among the below mentioned functions does not belong to the category of alternate functions usually performed by Port 3 (Pins 10-17)?
(i) External interrupts
(ii) Internal interrupts
(iii) Serial ports
(iv) Read/Write control signals

Search GoogleAsk AI
Worked SolutionAI Assisted

Answer: (ii) Internal interrupts

Explanation: Port 3 (P3.0–P3.7, pins 10–17) in 8051 has alternate functions:

  • P3.0 = RxD (serial input), P3.1 = TxD (serial output) → serial ports
  • P3.2 = INT0, P3.3 = INT1\ → external interrupts
  • P3.4 = T0, P3.5 = T1 (timer inputs)
  • P3.6 = WR, P3.7 = RD\ → external memory read/write strobes

There is no alternate function for "internal interrupts" on Port 3. All other options are valid Port-3 alternate functions. Hence (ii) does not belong.

Similar questions

MICROPROCESSORSWhich port has dual functionality in 8051? (i) Port 0 (ii) Port 2 (iii) Port 1 (iv) Port 320252mMICROPROCESSORSExplain the alternate functions of port 0, port 2 and port 3.20206mMICROPROCESSORSIn 8051, which register is used to enable or disable interrupts? (i) IE (ii) IP (iii) TCON (iv) PCON20242mOPERATING SYSTEMAn I/O port typically consists of four registers-status, control, ______ and ______ registers. (i) system in, system out (ii) flow in, flow out (iii) data in, data out (iv) input, output20242m
NextWhy are the resonators not preferred for an oscillator circuit of 8051? (i) Because they do not avail for 12 MHz higher order frequencies (ii) Because they are unstable as compared to quartz crystals (iii) Because cost reduction due to its utility is almost negligible in comparison to total cost of microcontroller board (iv) All of the above
Free AppAndroid App

Coursify Android App

Generate AI courses, take quick quizzes between classes, and master complex engineering concepts on the go.

Install Coursify