Accumulator
A register whose inputs and outputs are connected to the outputs and inputs of an adder is
frequently referred to as an accumulator. For example, consider the input at time t1 is xt1 and
the previous output is yt0
. The function of the accumulator is generate output as yt1 = xt1 +yt0
.
Build a register-adder circuit which has a 4-bit input and a 4-bit output. Demonstrate that
it will function as an accumulator, that is, it will compute and store a running sum of your
data inputs. Use LEDs to show the input and the output.
4 Project 2: Counter 1
Design a 4-bit counter that can count from 1 to 9, periodically. It should count up by 2, i.e.,
1,3,5,7,9, 1,· · · .
5 Project 3: Counter 2
Design a traffic light counter which counts from 9 down to 0. You can design a sequential
circuit with 7 segment display to show the numbers.
6 Project 4: Other Ideas
Students are free to come up with their own ideas. However, sequential circuits have to be
used and students have to submit a proposal to the instructor for approval before 4/15/2021.
Students are free to use microcontrollers as long as part of the circuits are designed using the
digital logic concepts that are covered in this class.