Message

Motorola recommends driving the xtal and grounding the extal.

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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

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-----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.

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

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