EET2411, Spring 2009 Experiment 9
Name________________________
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MOD-16 Counter, BCD Counter and Shift Register
Logic ICs used: 7493, 7447, 7474
Task 1:
Wire a 7493 "4 Bit Binary counter". Use the clock output to clock the counter.
Connect the clock output of the I/O circuit (or 1 Hz clock using the function
generator) to pin 14 (CP0*) of the 7493 counter. Jumper pin 1 (CP1*) to pin 12 (Q0)
of the 7493 for MOD-16 configuration, also ground either MR1 or MR2. Connect
Q0, Q1, Q2, and Q3 to LEDs and fill in an output table to show the counting
sequence.
Figure 1.0: 7493 Connection Diagram and Circuit Diagram
Task 2:
Change the configuration of Task 1 to be a BCD counter, the counter should
count 0000-1001. Connect Q0, Q1, Q2, and Q3 to LEDs and fill in an output table
to show the counting sequence.
Shift Registers
A simple shift register/Ring counter
Figure 2 shows the basic idea for a shift register/ring counter that shifts
information in from the left and moves it to the right. As can be seen this
design uses D flip flops although any flip flop can be used.
Figure 2.0: The basic shift register/ Ring Counter
Task 3:
Using the basic design of figure 2, design and Implement a four bit shift register that
shifts from right to left using 7474, D flip flops. Connect the outputs, Q<3:0> to LEDs
so that you can observe them. In your design make sure that you can set and reset the
shift register, i.e. set it to 1111 and reset it to 0000. Do this using the asynchronous
PRESET* and CLR* inputs of flip flop. Verify your design by Presetting and clearing
your 4 FFs to Initial state 1000, then apply your clock and observe the outputs as the
bits are shifted to the left and rotate back.
EET 2411
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Index:
Introduction:
Talk about the whole lab
Talk about specific components that you use
Task 9.x:
Talk about this task
Its relation to the previous lab experiments/ the whole lab
Calculations involved
Problems encountered and resolution
Circuit diagram