4. Design a digital circuit using three D flip-flops to control the shutdown sequence for an industrial dishwasher. The systems engineer has provided the following specification: The control circuit has one input: E (enable) The control circuit has three outputs: A, B, C When E= 0, the state of the circuit remains the same. When E= 1, the circuit outputs go through the transitions from 000 to 111 to 011 to 101, to 001, back to 000, and then repeats. Use the given signal names for the variables in your solution (E, A, B, C). Do not substitute different variable names. The flip-flop states should be the outputs. That is, make the flip-flop outputs the circuit outputs. Use don't cares in your solution for all unused states.

Q4 Table Q4 shows the mode and task that need to be implemented using PIC18F452. (a) Mode Switch (SW1) 1 Press 1 time 2 Press 2 times Table Q4 Task Move the LED right to left and continue back from left to right. Control the duty cycle of PWM for the period of 2 ms. You are given 1 switch, 1 potentiometer and 8 LEDs, sketch the interface between the components and PIC microcontroller. (b) Construct a C18 program to control the tasks in Table Q4. (4 marks)

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1. Consider the CRC generator shown below. Determine the output of the CRC circuit (i.e. Q4 Q3 Q2 Q1 Q0, expressed as a decimal number) for the input sequence "1010" (input one bit at a time, left to right). Assume the CRC circuit is initialized to state 11111. D Q0 Q2 Q4 Q1 Q3 Clock - Data In