Microprocessors Mock Test

1. for i/o of 8255,if -----, the word is taken as a bit set/rest word

2. IBF is an active-------- output signal for 8255

3. Asynchronous serial communication involves transmission of

4. Conversion time Tc of successive approximation ADC is given as

5. ADC 0808 operates on single ---- power supply

6. In ------ of 8255 ,bidirectionali/o data transfer is possible

7. 8255 has -------- i/o pins

8. Upon activation of------ signal,output device reads data from output port and acknowledges it

9. In 8255 ,BSR means -----

10. 8255 sets INTR when STB'=-----,IBF=---------,INTE=--------,for input conrol signals

11. BSR mode is used to set or reset the bitsin

12. Whichof the following is the fastest ADC

13. in ----, bidirectional data transfer is possible

14. To indicate end of conversion ADC 0808/0809 ACTIVATES -----SIGNAL

15. Transmission through telephone lines is an example of serial commuincation

16. Walkie talkie is an example of serial communication

17. 8255 has ----i/o modes

18. Asynchronous serial communication involves

19. for mode 3 of 8253/54, if the count is odd the output will be high for---

20. on activation of ----, 8255 loads data from the input port lines into the input buffer of that port

21. 8255 has three ----parallel ports

22. 8255 has three ----parrallel port

23. walkie-talkie is an example of serial communication

24. Adc 0808 uses ----technique

25. EOC means

26. to configure 8255 with port A output,Port B input port C lower output and port C upper input

27. A high on ----pin causes all 24 lines of three 8 bit ports to be in the input mode

28. 8253/54 has ----independent timers/counters

29. the signals provided by ADC are

30. For i/o mode of 8255,if -----,the word is taken as a mode definition word

31. Flash ADC consist of converters

32. 8253/54 timers can be programmed in---modes

33. ADC 0809 IS A ----- PIN IC

34. For i/o mode of 8255 ,if -----, the word is taken as a bit set/reset word

35. On activation of --------,8255 loads data from the input port lines into the input buffer of that port

36. ADC 0808 is ----- pin IC

37. Conversion time of ADC 0808 IS

38. in mode 0 of 8253/54 ----disables counting

39. A high on ---line indicates that the buffer register is empty

40. 8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter

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