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???
04/13/06 15:25
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#114217 - I suggest you do not
Responding to: ???'s previous message
I suggest you read the "MCS-51 user manual" for more detailed info on the hardware:

http://www.intel.com/design/mc...272383.htm


I suggest you do not. This link takes a very long time to download and include much stuff that has no value today, the significant parts can be fetched much faster through these 3 links
Chapter 1
http://www.semiconductors.philips.com/acrobat/v...ARCH_1.pdf

chapter 2
http://www.semiconductors.philips.com/acrobat/v...UIDE_1.pdf


chapter 3
http://www.semiconductors.philips.com/acrobat/v...WARE_1.pdf


"There are no requirements on the duty cycle of the external clock signal, because the input to the internal clock circuitry is through a divide-by-two flip-flop."
Typical techwriter gobbelygook. yes, the clock is fed to a flip flop, yes, ANY clocked flip-flop will "divide by 2".

Have a look at fig.15 on page 12 of ch1 and come back with "there is a divide by 2 of the clock"

Erik

List of 21 messages in thread
TopicAuthorDate
Capacitor significance            01/01/70 00:00      
   Search            01/01/70 00:00      
   Why burden caps must not be omitted            01/01/70 00:00      
      Thanks: But still some more            01/01/70 00:00      
         because that is when the address need be            01/01/70 00:00      
   Divide dy 2            01/01/70 00:00      
      Where is this divide by 2?            01/01/70 00:00      
         Thank you SIR            01/01/70 00:00      
            Beware of applying specifics in general!            01/01/70 00:00      
            Re: clock division...            01/01/70 00:00      
               I suggest you do not            01/01/70 00:00      
                  Misleading information            01/01/70 00:00      
                     Divide-by-12 = Divide-by-(2*6)            01/01/70 00:00      
                        Oops - 1us, not 1ms!!            01/01/70 00:00      
                  not exactly ...            01/01/70 00:00      
               it would not be so simple            01/01/70 00:00      
      Clock division - in summary            01/01/70 00:00      
         Re: Clk division summary            01/01/70 00:00      
            Language?            01/01/70 00:00      
               ok ok one more help            01/01/70 00:00      
                  Links            01/01/70 00:00      

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