Chapt:5

1.Distinguish between asynchronous and synchronous data transfer schemes?

2.explai n USART in detail with block diagram?

3.explain the advantages of using the USART chips

4.explain control word format of 8051?

5.discuss how 8251 is used for serial communication of data ?

6.what are the applications of8251?whether write operation with status word or command word registers

7.define modeword reg of 8251for Asynchronous and synchronous modes?

8.what is parity error,over run error or frame error in 8251?what is the hunt mode in 8251?

9.explin about USB with necessary examples?

10.define command word or status word reg of 8251?

11.what is RS232?give the voltage levels of RS232?give the two features of RS232?

12.bring the features of 8251?

13.a)explain what is the purpose of RS232 in serial communication?

b)explain how a serial data take place with a simple program?

Chapt6:

1.explain about Arch &block diagram a,components of 8259?

2.a)discuss about priorities of lines of 8259?

b)explain briefly the interfacing of 8253 with 8086 with an example?

3.explain about the EOI command by 8259A?

4.a)draw the pin diagram of 8259&explin briefly about the function of each pin?

b)draw the internal block diagram of 8259&explain about each block?

5.a)explain explain diagram of 8253?

b)explain about CW format&programming of8253?

6.with neat dia explain the interfacing of 8259 with 8086?