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Micro-controller Lab Test Paper-B
Q1. Choose correct option in following questions.

(i).The 8051 micro-controller has
(a) 128 bytes of RAM      (b) 64 bytes of RAM      (c) 4 K bytes of RAM       (d) None

(b) How many serial port are present in 8051 micro-controller?
(a)  4                            (b) 2                          (c) 3                               (d) 1

(iii) MOV A, @ R1 will:
(a) copy R1 to the accumulator       (b) copy the accumulator to R1   (c) copy the contents of memory whose address is in R1 to the accumulator   (d) copy the accumulator to the contents of memory whose address is in R1

(iv) Data transfer from I/O to external data memory can only be done with the MOV command.
(a)True                       (b) False                    (c) Can not Say                (d) none

(v) Registers R0-R7 are all ………bits wide?
(a) 8                           (b) 16                         (c) 32                             (d) 64

(vi)Which of the following is illegal?
(a) ADD  R3,#50      (b) ADD A, #50          (c) MOV R7, #50         (d) None

(vii) What is the result of following code and where is it kept?
MOV R4, #25 H, MOV A, #1F H, ADD A, R4
(a) A, 25 H                 (b) R4, 25 H              (c) A, 1 F                       (d) None

(viii) DJNZ refers to?
(a) ) Increment and jump if zero       (b) Increment and Jump if not zero  
(c) Decrement and jump if zero       (d) decrement and jump if not zero

(ix) Registers ACC and B are ----bits wide?
(A) 8                            (b) 16                      (c) 32                            (d) 4

(x) The total amount of external code memory that can be interfaced to the 8051 is:
(A) 32 K                       (b) 64 K                     (c) 256 K                 (d) 128 K 

Download...Test Paper-B 

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