3. You are designing a cash register system that will display dollar amounts owe

Question

3. You are designing a cash register system that will display dollar amounts owed and change due up to a value of $9999.99 Assuming the dollar sign is simply a sticker beside the display and the numbers are to be shown using 7-segment displays, how many displays will you need? a. b. To reduce the number of wires required by the display, you design the system based on time division multiplexing where only one 7-segment display is on at any moment in time What is the minimum frequency required such that the eye doesn't see the display updating? c.To generate the frequency found in 3.b, you will use cascaded dock dividers simil lar to homework 3 problem 3. Assume you have three mclk frequencies available for use:50 MHz 737, 28 kHz, and 8.8 127 kHz. Also, U1 and U2 are 8-bit dock dividers. Select an mdki, and j value that will produce a clk2 frequency as close as possible to the value found in 3.b. U1 U2 mclk cir cir clr

Explanation / Answer

a. 6 numbers of 7-segment LEDs will suffice. Dot point can be displayed along with digit.

b. Persistence of eyes for a 0.04 second is reported. 50Hz-60Hz will be ideal .

c. 8 bit clock divider can divide clock by 2^ 8 = 256. and cascaded divider can maximum divide (256 x 256) times. Hence 737.28kHz / 65536 = 11 Hz approx is nearest frequency

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