Que: 51 Which devices are specifically being used for converting serial to parallel and from parallel to serial respectively?
|
| a. timers |
| b. counters |
| c. registers |
| d. serial communication |
Que: 52 What is the difference between UART and USART communication?
|
| a. they are the names of the same particular thing, just the difference of A and S is there in it |
| b. one uses asynchronous means of communication and the other uses synchronous means of communication |
| c. one uses asynchronous means of communication and the other uses asynchronous and synchronous means of communication |
| d. one uses angular means of the communication and the other uses linear means of communication |
(c). one uses asynchronous means of communication and the other uses asynchronous and synchronous means of communication
Que: 53 Which of the following best describes the use of framing in asynchronous means of communication?
|
| a. it binds the data properly |
| b. it tells us about the start and stop of the data to be transmitted or received |
| c. it is used for error checking |
| d. it is used for flow control |
(b). it tells us about the start and stop of the data to be transmitted or received
Que: 54 Which of the following signal control the flow of data?
|
| a. RTS |
| b. DTR |
| c. Both of the mentioned |
| d. None of the mentioned |
Que: 55 Which of the following is the logic level understood by the micro-controller/micro-processor?
|
| a. TTL logic level |
| b. RS232 logic level |
| c. None of the mentioned |
| d. Both of the mentioned |
Que: 56 What is null modem connection?
|
| a. no data transmission |
| b. no MAX232 |
| c. the RxD of one is the TxD for the other |
| d. no serial communication |
(c). the RxD of one is the TxD for the other
Que: 57 Which of the following best states the reason that why baud rate is mentioned in serial communication?
|
| a. to know about the no of bits being transmitted per second |
| b. to make the two devices compatible with each other, so that the transmission becomes easy and error free |
| c. to use Timer 1 |
| d. for wasting memory |
(b). to make the two devices compatible with each other, so that the transmission becomes easy and error free
Que: 58 With what frequency UART operates( where f denoted the crystal frequency )?
|
| a. f/12 |
| b. f/32 |
| c. f/144 |
| d. f/384 |
Que: 59 What is the function of SCON register?
|
| a. to control SBUF and SMOD registers |
| b. to program the start bit, stop bit, and data bits of framing |
| c. none of the mentioned |
| d. both of the mentioned |
(b). to program the start bit, stop bit, and data bits of framing
Que: 60 What should be done if we want to double the baud rate?
|
| a. change a bit of the TMOD register |
| b. change a bit of the PCON register |
| c. change a bit of the SCON register |
| d. change a bit of the SBUF register |
(b). change a bit of the PCON register