Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Tue, 20 Oct 2020 11:34:33 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 09KIRGAK010741; Tue, 20 Oct 2020 14:27:18 -0400 Received: from outgoing-exchange-5.mit.edu (OUTGOING-EXCHANGE-5.MIT.EDU [18.9.28.59]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 09KIRFkD010738 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 20 Oct 2020 14:27:15 -0400 Received: from w92exedge4.exchange.mit.edu (W92EXEDGE4.EXCHANGE.MIT.EDU [18.7.73.16]) by outgoing-exchange-5.mit.edu (8.14.7/8.12.4) with ESMTP id 09KIR8w5029823 for ; Tue, 20 Oct 2020 14:27:15 -0400 Received: from oc11expo14.exchange.mit.edu (18.9.4.19) by w92exedge4.exchange.mit.edu (18.7.73.16) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Tue, 20 Oct 2020 14:26:45 -0400 Received: from oc11exhyb4.exchange.mit.edu (18.9.1.100) by oc11expo14.exchange.mit.edu (18.9.4.19) with Microsoft SMTP Server (TLS) id 15.0.1365.1; Tue, 20 Oct 2020 14:26:58 -0400 Received: from NAM04-DM6-obe.outbound.protection.outlook.com (104.47.73.46) by oc11exhyb4.exchange.mit.edu (18.9.1.100) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Tue, 20 Oct 2020 14:26:58 -0400 Received: from DM5PR06CA0094.namprd06.prod.outlook.com (2603:10b6:3:4::32) by BY5PR01MB6068.prod.exchangelabs.com (2603:10b6:a03:1c9::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.25; Tue, 20 Oct 2020 18:26:57 +0000 Received: from DM3NAM03FT029.eop-NAM03.prod.protection.outlook.com (2603:10b6:3:4:cafe::fe) by DM5PR06CA0094.outlook.office365.com (2603:10b6:3:4::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.22 via Frontend Transport; Tue, 20 Oct 2020 18:26:56 +0000 Received: from cedar.nocdirect.com (69.73.180.175) by DM3NAM03FT029.mail.protection.outlook.com (10.152.82.194) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.21 via Frontend Transport; Tue, 20 Oct 2020 18:26:54 +0000 Received: from 25.16.187.81.in-addr.arpa ([81.187.16.25]:59381 helo=[10.0.0.28]) by cedar.nocdirect.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1kUwLV-0002e6-2J for piclist@mit.edu; Tue, 20 Oct 2020 14:26:53 -0400 From: John Lawton To: "piclist@mit.edu" Sender: "piclist-bounces@mit.edu" Date: Tue, 20 Oct 2020 11:26:50 -0700 Subject: Re: [PIC] Crystal frequency selection Thread-Topic: [PIC] Crystal frequency selection Thread-Index: AdanD6gQQ54nB40XTvSbbdn8l3J3VQ== Message-ID: <6cdbb2e3-53e5-46e2-4156-900183699a03@jle.co.uk> References: <5F8EF750.1010301@narwani.org> <0480a0b2-d285-10da-1349-b6b688d850b6@nicolaperotto.it> <5F8F0FE8.2010908@narwani.org> <5F8F11A6.9040500@narwani.org> <6aad4f34-d2df-5783-a60c-b88141db6457@nicolaperotto.it> List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: <6aad4f34-d2df-5783-a60c-b88141db6457@nicolaperotto.it> Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US Content-Language: en-GB X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: None (protection.outlook.com: jle.co.uk does not designate permitted sender hosts) dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mitprod.onmicrosoft.com; s=selector2-mitprod-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=8y7Nbpxq0JvdHLhPv9FL7lmF7lp/Ev0JnfP+xQ06YlM=; b=D1utVdAu7Jri5gA6gWtjeBG/XAzZFbFIfMpyYlxy6X5wovxBRWqxc/G8yjivHdC12LMY91BW3AbHdMRHvThUwG4zMdse9KZ7GmS0rpLYJRGbUxCPty6zQzUqTmal2YMVASOYqFO7j2RfA9A7XzR56rS+7BziNTiOhgqeOkq8yr4= authentication-results: spf=none (sender IP is 69.73.180.175) smtp.mailfrom=jle.co.uk; mit.edu; dkim=none (message not signed) header.d=none;mit.edu; dmarc=none action=none header.from=jle.co.uk; user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-source-args: x-source-dir: x-antiabuse: Sender Address Domain - jle.co.uk x-source: x-authenticated-sender: cedar.nocdirect.com: piclist@jle.co.uk x-topics: [PIC] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 MCUgZXJyb3IgaXMgYWx3YXlzIGFzc3VtaW5nIHRoZSBjcnlzdGFsIGZyZXF1ZW5jeSBpcyBhcyBz dGF0ZWQuCgpKb2huCgoKCk9uIDIwLzEwLzIwMjAgMTk6MDQsIE5pY29sYSBQZXJvdHRvIHdyb3Rl Ogo+IEkgZG9uJ3QgdW5kZXJzdGFuZC4uLgo+IDEpIDAlIGVycm9yIGRvZXNuJ3QgZXhpc3RzLCBu ZXZlciEKPiAyKSBjcnlzdGFscyBoYXZlIGVycm9yLi4uCj4gWW91IGhhdmUgdG8gbWFpbnRhaW4g dGhlIGVycm9yIGluIGEgS05PV04sIGFjY2VwdGFibGUgcmFuZ2UhCj4gICDCoMKgwqDCoMKgIE4K Pgo+IFBTOiB3aXRoIGEgInJvdW5kIiBjcnlzdGFsIGl0J3Mgc2ltcGxlciB0byBjYWxjdWxhdGUg dGltaW5ncyA6LSkKPgo+Cj4gT24gMjAvMTAvMjAyMCAxODozNCwgTmVpbCB3cm90ZToKPj4gT2th eSwgSSBmb3VuZCBvbmUuLi4gMTQuNzQ1Nk1oeiBjcnlzdGFsIC0tPiA1OS45ODI0TWh6IEZvc2Ms IHdoaWNoIGlzCj4+IGNsb3NlIGVub3VnaCB0byA2NE1oei4KPj4gVXNpbmcgU1BCUkcgPSAxMjcg d2l0aCB0aGF0IGdpdmVzIG1lIHNwb3Qtb24gMTE1LDIwMCBiYXVkIChzbyAwJSBlcnJvcikuCj4+ IEFuZCB0aGVyZSBhcmUgMTArIHN1cHBsaWVycyBmb3IgMy4yIHggMi41bW0gU01EIGNyeXN0YWxz IHdpdGggdGhhdAo+PiBmcmVxdWVuY3kgc28gdGhhdCdzIGNvbW1vbiBlbm91Z2ggdG8gYmUgbG93 LWNvc3QgYW5kIG5vdCBoYXZlIHRvIHdvcnJ5Cj4+IGFib3V0IGJlaW5nIGRpc2NvbnRpbnVlZCBp biB0aGUgbmVhciBmdXR1cmUuCj4+IFdpc2ggSSBkaWRuJ3QgaGF2ZSB0byB0cmlhbCBhbmQgZXJy b3IgdGhpcyB0aG91Z2guCj4+Cj4+IENoZWVycywKPj4gLU5laWwuCj4+Cj4+Cj4+Cj4+Cj4+Cj4+ IE9uIDEwLzIwLzIwMjAgMTI6MjcgUE0sIE5laWwgd3JvdGU6Cj4+PiBJIGhhZCBhbHNvIGNyZWF0 ZWQgbXkgb3duLCBidXQgaXQncyBiZWVuIHRyaWFsLWFuZC1lcnJvciAoeHRhbCBmcmVxCj4+PiBh bmQgU1BCUkcgdmFsdWUpIHRvIGZpbmQgYSBzcG90LW9uIGNyeXN0YWwuCj4+PiBOb3csIGlmIHlv dXIgc3ByZWFkc2hlZXQgcnVucyB0aHJvdWdoIERJZ2lrZXkncyBjcnlzdGFsIGZyZXF1ZW5jeQo+ Pj4gc2VsZWN0aW9ucyBhbmQgcGlja3MgdGhlIHNwb3Qtb24gb3B0aW9uIGZvciBtZSwgdGhlbiB5 b3UgaGF2ZSBteQo+Pj4gYXR0ZW50aW9uIDopCj4+Pgo+Pj4gQ2hlZXJzLAo+Pj4gLU5laWwuCj4+ Pgo+Pj4KPj4+Cj4+PiBPbiAxMC8yMC8yMDIwIDEyOjA4IFBNLCBOaWNvbGEgUGVyb3R0byB3cm90 ZToKPj4+PiBIaSBOZWlsICYgYWxsLAo+Pj4+IEkgdXNlIHRoZSBhdHRhY2hlZCBzcHJlYWRzaGVl dCB0byBjYWxjdWxhdGUgYmF1ZCBhbmQgZXJyb3JzLgo+Pj4+IEVudGVyIHZhbHVlcyBpbiB5ZWxs b3cgY2VsbHMuCj4+Pj4gICAgICAgICBOCj4+Pj4KPj4+Pgo+Pj4+IE9uIDIwLzEwLzIwMjAgMTY6 NDIsIE5laWwgd3JvdGU6Cj4+Pj4+IEEgYml0IGFjYWRlbWljLCBidXQgdGhpcyBpcyBidWdnaW5n IG1lLi4uIEkgd2FzIHRyeWluZyB0byBnZXQgYXMgY2xvc2UKPj4+Pj4gdG8gMTE1LDIwMCBiYXVk IG9uIGEgUElDMThGIHJ1bm5pbmcgYXQgNjRNaHogKG9yIHRoZXJlYWJvdXRzKS4KPj4+Pj4gQXQg NjRNaHosIGJlc3QgSSBjYW4gZ2V0IGlzIDAuOCUgZXJyb3IgdXNpbmcgU1BCUkc9MzQuCj4+Pj4+ IENhbGN1bGF0aW5nIGJhY2t3YXJkcywgdG8gZ2V0IGV4YWN0bHkgMTE1LDIwMCwgSSBjYW4ndCBm aW5kIGFuICJleGFjdCIKPj4+Pj4gY3J5c3RhbC4KPj4+Pj4gU2hvdWxkbid0IEkgYmUgYWJsZSB0 byBmaW5kIG9uZSBvZiB0aG9zZSAib2RkIiB2YWx1ZXMgdG8gZ2V0IGV4YWN0bHkKPj4+Pj4gMTE1 LDIwMCBiYXVkIGF0IGFyb3VuZCA2NE1oej8KPj4+Pj4KPj4+Pj4gQ2hlZXJzLAo+Pj4+PiAtTmVp bC4KPj4+Pj4KPj4+PgoKLS0gCmh0dHA6Ly93d3cucGljbGlzdC5jb20vdGVjaHJlZi9waWNsaXN0 IFBJQy9TWCBGQVEgJiBsaXN0IGFyY2hpdmUKVmlldy9jaGFuZ2UgeW91ciBtZW1iZXJzaGlwIG9w dGlvbnMgYXQKaHR0cDovL21haWxtYW4ubWl0LmVkdS9tYWlsbWFuL2xpc3RpbmZvL3BpY2xpc3QK .