tcop
New Member
Hi,
I use two 74hc595 shift registers to drive 6 - 7 segment displays (common cathode) using the multiplexing technick. The first drives the anodes of the seven segment displays and the second drives the cathodes. I ve done it succcesfully but i faced the following problem. I dedicate RA1 pin of my 16f628 for producing the clock pulses but when i shared it to both the s/r one of them did not function properly so to resolve it i used an extra pin and a second clock sending exactly the same pulses to the second s/r. It seemed that i got a noise problem or something and havent yet found a solution apart from using an extra pin. Any ideas how to share the same clock to both the shift registers?
I use two 74hc595 shift registers to drive 6 - 7 segment displays (common cathode) using the multiplexing technick. The first drives the anodes of the seven segment displays and the second drives the cathodes. I ve done it succcesfully but i faced the following problem. I dedicate RA1 pin of my 16f628 for producing the clock pulses but when i shared it to both the s/r one of them did not function properly so to resolve it i used an extra pin and a second clock sending exactly the same pulses to the second s/r. It seemed that i got a noise problem or something and havent yet found a solution apart from using an extra pin. Any ideas how to share the same clock to both the shift registers?
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