Author Question: Which external resistor is necessary to cause a 25 msec pulse at the output of a 74121 monostable ... (Read 39 times)

asd123 · **on:** Jul 28, 2018

Which external resistor is necessary to cause a 25 msec pulse at the output of a 74121 monostable multivibrator when joined with a 10 F external capacitor?

A) 3.6 K resistor B) 20 K resistor C) 4.7 K resistor D) 10 K resistor

Question 2

Determine the contents of the accumulator after the execution of the following:
MOV A, 3CH; A = 00111100
MOV R4, 66H; R4 = 01100110
ANL A, R4; A = AND R4

A) 24H B) 30H C) 27H D) 28H