1. The 8051 is a 8 bit _____________________.
2. The 8051 is based on _____________ architecture.
3. The 8051 is  _______  ________  byte ordered microcontroller.
4. The EA signal(pin) is for __________ _________ of busses
5. The ram available at address 80H to FFfH is called ___________RAM.
6. The SFR’s  can only be addressed ________________.
7. The address space of  internal ROM is from ________H to _______H.
8. Bank selection bits in PSW are 0 & 1, R7 now refers to memory location ______.
9. The Timer mode is set by the ___________  SFR.
10. The Timer Run bit is available in __________SFR.
11. The timer mode 0 uses __________ bits for timing.
12. If the Crystal frequency is 12Mhz, the clock for the timer is ____ Mhz.
13. The Machine cycle of 8051 consists of ______ states and _____phases.
14. This is a program for delay produced by  executing the instruction DJNZ which takes 2 machine cycles.                                                                                                                             (a)  One of the loop back label is wrong, correct it .        …1M

 

(b) What is the number of times the program executes before            

       it returns to the calling program.                               ….1M

15. The priority of the interrupts in highest to lowest(1 to 5) is                    ….2M

 

1._______________                                    

2._______________                                                                        

3._______________                                    

4._______________                                    

5._______________                                                            

16. The Enable all interrupts is in register ___________  ____________.
17. The MOVX is used to access ______________  _____________
18. The ________  & _________ are 16 bit registers              

 

BOLCRS