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???
09/02/06 15:52
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 		 #123577 - thanks for all replies,
Responding to: ???'s previous message
Firstly thanks for all replies.

To Richard:
The load cap. values are consistent for the system as recomended in the datasheet.(33pF)But I
also tried different caps which had less values. And I have been using the basic
XTAL&cap. configuration which is illustrated in the datasheet.
In addition, the operating voltage is +5V in my system. In the datasheet
it is said that the max. operating voltage can be chosen +6V.
What do you recomend for the operating voltage? +5.5V or something like that will be useful?

To Neil:
If you imply that the crystal is new, yes it is a new crystal.Never used before. And what type of crystal is necessary?Could you explain pls?

To Andy:
Yes, your aproximation is right, but as far as I know there is a RC circuit in the chip to
initially activate. If I'm wrong pls correct me. And for the PIC series, the programmer must
define the osc. frequency by software. So I thought that, maybe for the 89C52 same procedure must be kept.

By the way, is there anybody who has used 8259A programmable Interrupt Controller chip?
Thanks,
BC

List of 41 messages in thread
TopicAuthorDate
20 MHz osc.            01/01/70 00:00      
   no answer            01/01/70 00:00      
      by oscilloscope probe            01/01/70 00:00      
         WHAT DERIVATIVE? WHAT VOLTAGE            01/01/70 00:00      
            Why Erik is asking            01/01/70 00:00      
               Do standard i8052's work at 20 MHz?            01/01/70 00:00      
                  who c ares            01/01/70 00:00      
                     Maybe he don't know what a "derivative" is??            01/01/70 00:00      
         ALE probably won't help ...            01/01/70 00:00      
            it will            01/01/70 00:00      
               true enough, but he knows it\'s not oscillating            01/01/70 00:00      
                  you never know            01/01/70 00:00      
                     FET buffer is suited to touch the oscillator pins            01/01/70 00:00      
                        Or a FET probe for your 'scope            01/01/70 00:00      
                           Of course, but expensive...            01/01/70 00:00      
                              Yes, but necessary            01/01/70 00:00      
                                 Dont take it too literaly...            01/01/70 00:00      
                                    quite true            01/01/70 00:00      
                                       we'll never know            01/01/70 00:00      
                                 Ah, now I know what you mean!            01/01/70 00:00      
                                 Low capacitance probes.            01/01/70 00:00      
   That would be tricky...            01/01/70 00:00      
      Well            01/01/70 00:00      
   thanks for all replies,            01/01/70 00:00      
      8259            01/01/70 00:00      
      Operating?            01/01/70 00:00      
      Crystal Types            01/01/70 00:00      
         Xtal            01/01/70 00:00      
            ???            01/01/70 00:00      
               SMS reply            01/01/70 00:00      
                  Only NP0 ceramics must be used!            01/01/70 00:00      
                     I'm curious            01/01/70 00:00      
      Some answers...            01/01/70 00:00      
      no thanks            01/01/70 00:00      
      You really SHOULD respond            01/01/70 00:00      
         So many people SHOULD...            01/01/70 00:00      
            if only they WOULD            01/01/70 00:00      
   Use Inductor            01/01/70 00:00      
      Yes, but at the right place!            01/01/70 00:00      
         so why bother            01/01/70 00:00      
   and why bother #2            01/01/70 00:00      

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