Digital Electronics-Shift Registers
Digital Electronics-Shift Registers
31. In a parallel in/parallel out shift register, D0 = 1, D1 = 1, D2 = 1, and D3 = 0. After three clock pulses, the data outputs are ________.
- 1110
- 0001
- 1100
- 1000
32. The group of bits 10110111 is serially shifted (right-most bit first) into an 8-bit parallel output shift register with an initial state 11110000. After two clock pulses, the register contains ________.
- 10111000
- 10110111
- 11110000
- 11111100
33. By adding recirculating lines to a 4-bit parallel-in, serial-out shift register, it becomes a ________, ________, and ________-out register.
- parallel-in, serial, parallel
- serial-in, parallel, serial
- series-parallel-in, series, parallel
- bidirectional in, parallel, series
34. What type of register would have a complete binary number shifted in one bit at a time and have all the stored bits shifted out one at a time?
- parallel-in, parallel-out
- parallel-in, serial-out
- serial-in, parallel-out
- serial-in, serial-out
35. When an 8-bit serial in/serial out shift register is used for a 20 s time delay, the clock frequency is ________.
- 40 kHz
- 50 kHz
- 400 kHz
- 500 kHz
36. Ring shift and Johnson counters are:
- synchronous counters
- aynchronous counters
- true binary counters
- synchronous and true binary counters
37. What is the difference between a shift-right register and a shift-left register?
- There is no difference.
- the direction of the shift
38. What is a transceiver circuit?
- a buffer that transfers data from input to output
- a buffer that transfers data from output to input
- a buffer that can operate in both directions
39. 74HC195 4-bit parallel access shift register can be used for ________.
- serial in/serial out operation
- serial in/parallel out operation
- parallel in/serial out operation
- all of the above
40. Which type of device may be used to interface a parallel data format with external equipment's serial format?
- key matrix
- UART
- memory chip
- series in, parallel out