Forums

external oscillator

Started by esecece October 25, 2003
I want use an external oscillator with 56F807, to avoid problems
with the internal one at low temperatures.
DSP56f801-7 user's manual recommends to drive the xtal input and
ground extal (when using external oscillator). But it says that also
is possible to drive extal and left unconnected xtal. Which is the
best method ?
Thanks



I must insist. In section 15.3.2.2, figure 15-2 the users manual recommends
driving xtal and ground extal.
In section 15.5 the manual gives as second option: "External clock source, uses
EXTAL pin."
I think this is another errata in the manual. But nobody has used an external
oscillator ? Nobody can recommend one method ? If not, I dont understand the
utility of this board. ----- Original Message -----
From: esecece
To:
Sent: Saturday, October 25, 2003 11:59 PM
Subject: [motoroladsp] external oscillator I want use an external oscillator with 56F807, to avoid problems
with the internal one at low temperatures.
DSP56f801-7 user's manual recommends to drive the xtal input and
ground extal (when using external oscillator). But it says that also
is possible to drive extal and left unconnected xtal. Which is the
best method ?
Thanks

_____________________________________
Note: If you do a simple "reply" with your email client, only the author of
this message will receive your answer. You need to do a "reply all" if you want
your answer to be distributed to the entire group.

_____________________________________
About this discussion group:

To Join:

To Post:

To Leave:

Archives: http://www.yahoogroups.com/group/motoroladsp

More Groups: http://www.dsprelated.com/groups.php3


Message
Motorola recommends driving the xtal and grounding the extal.
 
 

-----------------------------------
John L. WintersSr. Application Engineer DSP Operation 8/16 Bit Products Division Transportation & Standard Products Group Motorola Inc. 2100 E. Elliot Road, Tempe, Arizona 85284

-----------------------------------
* For faster turnaround in answering support questions please access *
* Motorola's Customer Support web site at *
* http://www.motorola.com/semiconductors/support *
* *
* Or send email to: D...@motorola.com *
-----------------------------------

 Motorola Confidential and Proprietary


-----Original Message-----
From: Santi Corera [mailto:s...@telefonica.net]
Sent: Monday, November 03, 2003 10:41 AM
To: m...@yahoogroups.com; esecece
Subject: Re: [motoroladsp] external oscillator

I must insist. In section 15.3.2.2, figure 15-2 the users manual recommends driving xtal and ground extal.
In section 15.5 the manual gives as second option: "External clock source, uses EXTAL pin."
I think this is another errata in the manual. But nobody has used an external oscillator ? Nobody can recommend one method ? If not, I dont understand the utility of this board.----- Original Message -----
  From: esecece
  To: m...@yahoogroups.com
  Sent: Saturday, October 25, 2003 11:59 PM
  Subject: [motoroladsp] external oscillator  I want use an external oscillator with 56F807, to avoid problems
  with the internal one at low temperatures.
  DSP56f801-7 user's manual recommends to drive the xtal input and
  ground extal (when using external oscillator). But it says that also
  is possible to drive extal and left unconnected xtal. Which is the
  best method ?
  Thanks       
            
      
      

  _____________________________________
  Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer.  You need to do a "reply all" if you want your answer to be distributed to the entire group.

  _____________________________________
  About this discussion group:

  To Join:  m...@yahoogroups.com

  To Post:  m...@yahoogroups.com

  To Leave: m...@yahoogroups.com

  Archives: http://www.yahoogroups.com/group/motoroladsp

  More Groups: http://www.dsprelated.com/groups.php3  ">Yahoo! Terms of Service.