Digital Electronics- The 8051 Microcontroller
Digital Electronics- The 8051 Microcontroller
31. When the 8051 is reset and the EA line is LOW, the program counter points to the first program instruction in the:
- internal code memory
- external code memory
- internal data memory
- external data memory
32. The designs of a centigrade thermometer and a PWM speed-control circuit can be implemented by the 8051.
- TRUE
- FALSE
33. What is the difference between the 8031 and the 8051?
- The 8031 has no interrupts.
- The 8031 is ROM-less.
- The 8051 is ROM-less.
- The 8051 has 64 bytes more memory.
34. To interface external EPROM memory for applications, it is necessary to demultiplex the address/data lines of the 8051.
- TRUE
- FALSE
35. The following command will copy the accumulator to the location whose address is 23H:
MOV 23H,A
MOV 23H,A
- TRUE
- FALSE
36. The special function registers can be referred to by their hex addresses or by their register names.
- TRUE
- FALSE
37. The contents of the accumulator after this operation
MOV A,#2BH
ORL A,00H
will be:
MOV A,#2BH
ORL A,00H
will be:
- 1B H
- 2B H
- 3B H
- 4B H
38. The following program will cause the 8051 to be stuck in a loop:
LOOP: MOV A, #00H
JNZ LOP
LOOP: MOV A, #00H
JNZ LOP
- TRUE
- FALSE
39. Which of the following commands will copy the contents of RAM whose address is in register 0 to port 1?
- MOV @ P1, R0
- MOV @ R0, P1
- MOV P1, @ R0
- MOV P1, R0