The document discusses the 8051 microcontroller, including memory refreshing in DRAM, the architecture of the 8051 microcontroller, the various modes of 8051 timers, and how to interface a matrix keyboard with the 8051 microcontroller.

1. 8051 Microcontroller Question
and Answers - 2

2. Write a short note on RWM refreshing.
Memory refresh is a background maintenance process required during the operation of
semiconductor dynamic random-access memory (DRAM), the most widely used type of computer
memory, and in fact is the defining characteristic of this class of memory.

3. Explain the architecture of an 8051
microcontroller.

4. Explain the various modes of 8051 timers.

5. Explain how to interface a matrix keyboard
with 8051 Microcontroller.