81
Which among the below stated statements does not exhibit the characteristic feature of 16-bit microcontroller?
Answer: Limited Control Applications
Questions
82
Which word size is approved to be of greater importance for performing the small computational tasks along with its storage usability feature adopted by ASCII code?
Answer: 8-bit
83
Which minimum mode signal is used for demultiplexing the data and address lines with the assistance of an external latch in a microprocessor while accessing memory segment?
Answer: ALE
84
Why do the microprocessors possess very few bit manipulating instructions?
Answer: Because they mostly operate on byte/word data
85
How does the microcontroller communicate with the external peripherals/memory?
Answer: via I/O ports
86
Which functioning element of microcontroller generate and transmit the address of instructions to memory through internal bus?
Answer: Program Counter
87
Which instructions contribute to an effective adoption or utilization of stack memory which usually plays a crucial role in storage of intermediate results?
Answer: All of the above
88
What is the status of stack pointer for the execution of PUSH and POP operations?
Answer: It gets pre-incremented for PUSH & post-decremented for POP
89
Which among the category of program branching instructions allow 16 bit address to be specified & can jump anywhere within 64K block of program memory?
Answer: Long jumps (LJMP)
90
What is the possible range of transfer control for 8-bit relative address especially in 2’s complement form with respect to the first byte of preceding instruction?
Answer: -128 to 127 bytes
91
Which among the single operand instructions complement the accumulator without affecting any of the flags?
Answer: CPL
92
Which rotate instruction/s has an ability to modify CY flag by moving the bit-7 & bit-0 respectively to an accumulator?
Answer: RLC & RRC
93
Which form of instructions also belong to the category of logical instructions in addition to bitwise logical instructions?
Answer: All of the above
94
What can be the oscillator period for the multiplication operation of A & B in accordance to 16-bit product especially in B:A registers?
Answer: 48
95
How many bytes are supposed to get occupied while subtracting indirect RAM from an accumulator along with borrow under the execution of SUBB A, @Ri?
Answer: 1
96
Which flag allow to carry out the signed as well as unsigned addition and subtraction operations?
Answer: OV
97
What does the instruction XCHD A, @Ri signify during the data transfer in the program execution?
Answer: Exchange of low order digit indirect RAM with an accumulator
98
Which instruction should be adopted for moving an accumulator to the register from the below mentioned mnemonics?
Answer: MOV Rn, A
99
What kind of PSW flags remain unaffected by the data transfer instructions?
Answer: All of the above
100
How many single byte, two-byte and three-byte instructions are supported by MCS-51 from the overall instruction set?
Answer: 45 – single byte, 45 two-byte & 17 three-byte instructions
