Author Question: What does the instruction ADD A, Rn do? A) It adds the contents of memory to the register Rn and ... (Read 67 times)

stevenposner · **on:** Jul 28, 2018

What does the instruction ADD A, Rn do?

A) It adds the contents of memory to the register Rn and places the result in the register Rn.
B) It adds the contents of register Rn to the accumulator and places the result in the memory.
C) It adds the contents of memory to the register Rn and places the result in the accumulator.
D) It adds the contents of register Rn to the accumulator and places the result in the accumulator.

Question 2

In astable operation, the time period of the 555 timer output is expressed as

A) tw = tLO + tHI B) tw = R(.693 ) C) tw = RextCext D) tw = Rext + Rint