Question

ADD A, # 17H ADD A, #10H A. 1BH B. 40H D. 28H 11. A microcontroller's program counter is typically as wide as the data bus B. control bus ddress bus D. largest bus width 12. Which of the following instructions is used to access data elements of lookup table entries the program ROM space of the 8051? A. MOV @RO, A

what's the right answer
multiple choices

Answer 1

11)

A microcontroller's program counter is typically as wide as the address bus.

Because

let us consider 8051 microcontroller,

its program counter is 16 bits wide.

its address bus is 16 bits wide.

Hence A microcontroller's program counter is typically as wide as the address bus.

12)

MOVC A,@A+DPTR is the instruction to access data elements of lookup table entries located in the program ROM space of the 8051.

Because,

In MOVC C means Code. Here, to the 16 bit register DPTR the contents are added for forming the 16 bit address of neeeded lookup data.