microcontroller 8051 basic interview questions pdf

Address line malfunctioning due to a short in circuit.Damage of memory devices static discharges and transient current.List out some of the commonly found errors in Embedded Systems?Īns: Some of the commonly found errors in embedded systems are: For instance, the case of a program state continuously being verified for any exceptional errors that might just happen during run-time such as memory outage or divide by zero, etc. Explain what is the need for an infinite loop in embedded systems?Īns: Embedded systems require infinite loops for repeatedly processing or monitoring the state of the program. Between two events finding the time interval.Īns: A watchdog timer is an electronic device or electronic card that execute specific operation after certain time period if something goes wrong with an electronic system.Capturing the count value in timer on an event.Initiating an even after a comparison of preset times.Initiating an event after a preset time delay.List out various uses of timers in embedded system?Īns: Timers in embedded system are used in multiple ways: While ISA, EISA, PCI are standard buses for parallel communication used in PCs, computer network devices, etc. USB: It is used for communication between CPU and devices like mouse, etc.CAN: It is used in automobiles with centrally controlled network.I2C: It is used for communication between multiple ICs.Mention what are buses used for communication in embedded system?Īns: For embedded system, the buses used for communication includes: By writing minor ISR routines, interrupt latency can be reduced. Explain what is interrupt latency? How can you reduce it?Īns: Interrupt latency is a time taken to return from the interrupt service routine post handling a specific interrupt. It is a device which directly drives the data and address bus during data transfer. What does DMA address will deal with?Īns: DMA address deals with physical addresses. built into it and specifically designed for control.

Mention what is the difference between microprocessor and microcontroller?Īns: Microprocessor is managers of the resources (I/O, memory) which lie outside of its architecture.

Explain what is microcontroller?Īns: The microcontroller is a self-contained system with peripherals, memory and a processor that can be used as embedded system. This environment is connected to the computer system through actuators, sensors, and other input-output interfaces. Explain what are real-time embedded systems?Īns: Real-time embedded systems are computer systems that monitor, respond or control an external environment. Mention how I/O devices are classified for embedded system?Īns: The I/O devices of embedded system are classified into two categories:Īns: With embedded system, it is possible to replace dozens or even more of hardware logic gates, input buffers, timing circuits, output drivers, etc.

It runs a process as per scheduling and do the switching from one process to another.

The need to limit power lost when running the system continuously.

It checks the Processor Speed availability.

It ensures the availability of System Memory.

Mention what are the essential components of embedded system?Īns: Essential components of embedded system includes: It is a system with a dedicated function within a larger electrical or mechanical system. Explain what is embedded system in a computer system?Īns: An embedded system is a computer system that is part of a larger system or machine. In this section, we will discuss various topics on 8051 Microcontroller.Q1. 8051 belongs to MCS-51 family of Intel Microcontrollers. So it is treated as the second generation microcontroller. The first generation Intel Microcontroller was 8048. The microcontroller is more complex than microprocessors based on their architecture. These kinds of microcontrollers are used in different appliances like televisions, washing machines, telephones or some other electronic gadgets. As most of the required components are inside the chip, so the cost of application is also reduced. Some microcontroller also contains the ADC in it. The Microcontroller contains the RAM and ROM, IO ports inside it. As we know Microprocessor like 8085, Z-80 or M6800 contains the ALU, control unit and some registers, but there were no internal storages. It is a very famous Microcontroller of Intel family.

The 8051 Microcontroller is designed by Intel in 1981.

Microcontroller 8051 basic interview questions pdf