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chirag
Joined: 16 Feb 2006
Posts: 1
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 Posted: Thu Feb 16, 2006 4:02 am Post subject: 8085 Microprocessor |
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| I wanted to know that altough the 8085 microprocessor is a 3 Mhz microprocessor but it is given a 6 Mhz clock pulse i know that this frequency is internally divided into 2 to get 3 Mhz but why is this done??? |
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fRaSsL
Joined: 31 Mar 2003
Posts: 1570
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| Posted: Thu Feb 16, 2006 4:24 am Post subject: |
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The frequency of a normal oscilator is non-symetric. For running a CPU you need a symetric clock pulse!
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Thu Feb 16, 2006 4:24 am Post subject: |
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| that is a very good question, I am not 100% certain.. its one of those things that is just "done". Take the Microchip PIC, its clock cycle is internally divided down by 4. So 4 Mhz in = 1Mhz internal clock. I always thought it was something to do with cleaning up the clock edges. |
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Thu Feb 16, 2006 4:27 am Post subject: |
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I think I was asleep during that lecture, or probably playing Tomb Raider. but yea.. makes sense, to get the clock symmetrical.... a.k.a. clean up the clock pulse.  there must be other reasons….. anyone?? |
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