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LED Driver

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I have a 3digit seven segment display connected to the dspic using three 74HCT574(OCTAL DTYPE FLIP FLOP). The clk on 74hct574 is supplied with the dspic's INTerrupt pins INT1,INT2,INT3 and inputs are supplied with dspic portD pins now how do I interface another 3digit display to this design?

Will I be able to use the same interrupt pins to supply the clock for the another 3digit display?
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